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434

422

433

422

Dilutive effect of Series A Preferred Units (in units)

Dilutive effect of performance units (in units)

Diluted weighted average number of outstanding units

435

422

434

422

Performance Units, Restricted Units, and Phantom Units

Dilutive effect of unit-based awards (in dollars per unit) (less than $.01)

$ 0.01

$ 0.00

Phantom units

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

^[1]

Common Units

Net Income Attributable to Common and Subordinated Units (Note 3)

$ 71

$ 56

$ 174

$ 117

Diluted net income

$ 71

$ 56

$ 174

$ 117

^[1]

298

214

250

214

Diluted weighted average number of outstanding units

Basic earnings per unit

$ 0.24

$ 0.26

$ 0.70

$ 0.55

299

214

251

214

Diluted earnings per unit

$ 0.24

$ 0.26

$ 0.69

$ 0.55

Subordinated Units

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

Net Income Attributable to Common and Subordinated Units (Note 3)

$ 33

$ 54

$ 127

$ 114

Diluted net income

$ 33

$ 54

$ 127

$ 114

136

208

183

208

Diluted weighted average number of outstanding units

Basic earnings per unit

$ 0.24

$ 0.26

$ 0.69

$ 0.55

136

208

183

208

Diluted earnings per unit

$ 0.24

$ 0.26

$ 0.69

$ 0.55

[1]	Basic weighted average number of outstanding common units for the three and nine months ended September 30, 2017 includes approximately one million time-based phantom units.

Partners' Equity -Schedule of Cash Distributions (Details) - USD ($)

Nov. 21, 2017

Nov. 14, 2017

Oct. 31, 2017

Aug. 29, 2017

Aug. 22, 2017

Aug. 14, 2017

Jul. 31, 2017

May 30, 2017

May 23, 2017

May 12, 2017

May 02, 2017

Feb. 28, 2017

Feb. 21, 2017

Feb. 15, 2017

Feb. 10, 2017

Nov. 22, 2016

Nov. 14, 2016

Nov. 01, 2016

Aug. 23, 2016

Aug. 16, 2016

Aug. 12, 2016

Aug. 02, 2016

May 13, 2016

May 06, 2016

Feb. 12, 2016

Feb. 02, 2016

Distribution Made to Limited Partner [Line Items]

Aug. 22, 2017

May 23, 2017

Feb. 21, 2017

Nov. 14, 2016

Aug. 16, 2016

May 06, 2016

Feb. 02, 2016

Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

Aug. 29, 2017

May 30, 2017

Feb. 28, 2017

Nov. 22, 2016

Aug. 23, 2016

May 13, 2016

Feb. 12, 2016

Distribution Made to Limited Partner [Line Items]

Jul. 31, 2017

May 02, 2017

Feb. 10, 2017

Nov. 01, 2016

Aug. 02, 2016

May 06, 2016

^[1]

Distribution Made to Limited Partner [Line Items]

Aug. 14, 2017

May 12, 2017

Feb. 15, 2017

Nov. 14, 2016

Aug. 12, 2016

May 13, 2016

^[1]

Cash Distribution

$ 0.31800

$ 0.318

$ 0.31800

$ 0.318

Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

$ 138,000,000

$ 137,000,000

$ 134,000,000

Distribution Made to Limited Partner [Line Items]

$ 0.62500

$ 0.625

$ 0.2917

^[1]

Full quarter equivalent distribution declared (in dollars per unit)

$ 9,000,000

$ 4,000,000

^[1]

$ 0.625

Annualized distribution declared (in dollars per unit)

$ 2.50

Scenario, Forecast | Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

Distribution Made to Limited Partner [Line Items]

Subsequent Event | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

$ 0.62500

Distribution Made to Limited Partner [Line Items]

Subsequent Event | Cash Distribution

^[2]

Oct. 31, 2017

Distribution Made to Limited Partner [Line Items]

Cash distribution declared (in dollars per unit)

$ 0.318

Subsequent Event | Scenario, Forecast

Distribution Made to Limited Partner [Line Items]

^[3]

Nov. 14, 2017

Subsequent Event | Scenario, Forecast | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

^[3]

Nov. 21, 2017

Distribution Made to Limited Partner [Line Items]

Subsequent Event | Scenario, Forecast | Cash Distribution

^[2]

Nov. 14, 2017

Distribution Made to Limited Partner [Line Items]

^[3]

$ 0.31800

Subsequent Event | Scenario, Forecast | Cash Distribution | Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units | Preferred Units

^[3]

$ 138,000,000

Distribution Made to Limited Partner [Line Items]

^[2]

$ 0.62500

Cash distribution declared (in dollars per unit)

^[2]

$ 9,000,000

$ 0.625000000

[1]	The prorated quarterly distribution for the Series A Preferred Units is for a partial period beginning on February 18, 2016, and ending on March 31, 2016, which equates to $0.625 per unit on a full-quarter basis or $2.50 per unit on an annualized basis.
[2]	The board of directors of Enable GP declared a $0.625 per Series A Preferred Unit cash distribution on October 31, 2017, to be paid on November 14, 2017, to Series A Preferred unitholders of record at the close of business on October 31, 2017.
[3]	The board of directors of Enable GP declared this $0.318 per common unit cash distribution on October 31, 2017, to be paid on November 21, 2017, to common unitholders of record at the close of business on November 14, 2017.

Partners' Equity Textual (Details) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended
	May 12, 2017 USD ($)	Nov. 29, 2016 USD ($) $ / shares shares	Feb. 18, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Aug. 30, 2017 shares	Dec. 31, 2016 shares
Distribution Made to Limited Partner [Line Items]
Limited partners' capital account, required quarterly distribution period					60 days
Proceeds from issuance of Series A Preferred Units, net of issuance costs					$ 0	$ 362,000
Repayment of notes payable—affiliated companies					$ 0	$ 363,000
Number of common units sold \| shares		75,719
Subordinated Units
Distribution Made to Limited Partner [Line Items]
Units outstanding \| shares				0	0		207,855,430	207,855,430
Conversion basis							1
CenterPoint \| Limited Partner
Distribution Made to Limited Partner [Line Items]
Repayment of notes payable—affiliated companies			$ 363,000
ATM Program
Distribution Made to Limited Partner [Line Items]
Expenses related to the offering				$ 0	$ 345
Aggregate offering price	$ 200,000
Number of common units sold \| shares				0	18,500
Proceeds received from the offering				$ 0	$ 303
Commissions				$ 0	$ 3
Public Offering
Distribution Made to Limited Partner [Line Items]
Number of common units sold \| shares		10,000,000
Price per common unit \| $ / shares		$ 14.00
Proceeds received from the offering		$ 137,000
Over-Allotment Option
Distribution Made to Limited Partner [Line Items]
Number of common units sold \| shares		1,500,000
Over-Allotment Option \| Affiliate of ArcLight Capital Partners, LLC
Distribution Made to Limited Partner [Line Items]
Number of common units sold \| shares		1,424,281
Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units
Distribution Made to Limited Partner [Line Items]
Annual distribution percentage rate			10.00%
Liquidation preference (in dollars per unit) \| $ / shares			$ 25.00
Period after date of original issue			5 years
Redemption price (in dollars per unit) \| $ / shares			$ 25.50
Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units \| LIBOR
Distribution Made to Limited Partner [Line Items]
Annual distribution percentage rate			8.50%
Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units \| Private Placement
Distribution Made to Limited Partner [Line Items]
Issuance of Series A Preferred Units, units \| shares			14,520,000
Cash purchase price (in dollars per unit) \| $ / shares			$ 25.00
Proceeds from issuance of Series A Preferred Units, net of issuance costs			$ 362,000
Expenses related to the offering			$ 1,000
Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units \| Private Placement \| CenterPoint \| Limited Partner
Distribution Made to Limited Partner [Line Items]
Issuance of Series A Preferred Units, units \| shares			14,520,000
Cash purchase price (in dollars per unit) \| $ / shares			$ 25.00
Proceeds from issuance of Series A Preferred Units, net of issuance costs			$ 362,000
Maximum
Distribution Made to Limited Partner [Line Items]
Limited partners' capital account, incentive distribution rights, percentage					50.00%
Minimum
Distribution Made to Limited Partner [Line Items]
Incentive distribution, distribution (in dollars per unit) \| $ / shares					$ 0.330625

Assessing Impairment of Long-lived Assets (including Intangible Assets) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of long-lived assets	$ 0	$ 8	$ 0	$ 8

Investment in Equity Method Affiliate - Narrative (Details) - SESH - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%		50.00%
Percentage of distributions through limited partner interest			50.00%
Equity Method Investee \| Shared Operations Service Agreements
Schedule of Equity Method Investments [Line Items]
Amount billed associated with service agreements	$ 3	$ 3	$ 14	$ 12

Investment in Equity Method Affiliate - Schedule of Investments (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Equity in Earnings of Equity Method Affiliates:

Equity in earnings of equity method affiliate

$ 7

$ 8

$ 21

$ 22

Distributions from Equity Method Affiliates:

Return on investment in equity method affiliate

Return of investment in equity method affiliate

SESH

Equity in Earnings of Equity Method Affiliates:

Equity in earnings of equity method affiliate

Distributions from Equity Method Affiliates:

Distributions from equity method affiliate

^[1]

Return on investment in equity method affiliate

Return of investment in equity method affiliate

Revenues

Operating income

Net income

$ 14

$ 15

$ 40

$ 43

[1]	Distributions from equity method affiliate includes a $21 million and $22 million return on investment and a $9 million and $18 million return of investment for the nine months ended September 30, 2017 and 2016, respectively.

Debt - Schedule of Outstanding Debt (Details) - USD ($)
$ in Millions

Sep. 30, 2017

Dec. 31, 2016

$ 3,123

$ 2,986

Less: Unamortized debt expense

3,134

3,003

^[1]

Total long-term debt

2,669

2,993

2015 Term Loan Agreement | 2015 Term Loan Agreement

450

Less: Current portion of long-term debt

450

450

Senior Notes | 2019 Notes

500

Senior Notes | 2024 Notes

500

600

(1)

Senior Notes | 2027 Notes

600

599

700

(3)

Senior Notes | 2044 Notes

697

550

Senior Notes | EOIT Senior Notes | EOIT

550

250

Revolving Credit Facility

264

268

636

Unamortized debt expense related to Revolving Credit Facility

636

$ 3

$ 5

[1]	As of September 30, 2017 and December 31, 2016, there was an additional $3 million and $5 million, respectively, of unamortized debt expense related to the Revolving Credit Facility included in Other long-term assets, not included above.

Debt - Narrative (Details)				9 Months Ended
Debt - Narrative (Details)	Mar. 09, 2017 USD ($)	Jul. 31, 2015 USD ($) time	Jun. 18, 2015 USD ($) time	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Commercial paper, authorized				$ 1,400,000,000
Outstanding Principal				3,123,000,000	$ 2,986,000,000
Term loan facility \| 2015 Term Loan Agreement
Debt Instrument [Line Items]
Number of times option maybe exercised to extend term of Term Loan Facility \| time		2
Extension period		1 year
Duration of term loan facility		3 years
Amount of loan agreement		$ 450,000,000
Minimum prepayment amount of option to prepay without penalty or premium (minimum amount of $1 million)		1,000,000
Multiple amount of prepayment in excess of minimum prepayment		$ 500,000.0
Term loan facility				$ 450,000,000
Weighted average interest rate percentage				2.38%
Term loan facility \| LIBOR \| 2015 Term Loan Agreement
Debt Instrument [Line Items]
Applicable margin percentage				1.375%
Senior Notes \| 2027 Notes
Debt Instrument [Line Items]
Amount of loan agreement	$ 700,000,000
Fixed interest rate percentage	4.40%
Net proceeds	$ 691,000,000
Unamortized discount				$ 3,000,000
Unamortized debt expense				6,000,000
Outstanding Principal				$ 700,000,000	0
Effective interest rate percentage				4.58%
Senior Notes \| Senior Notes including 2019 Notes, 2024 Notes, and 2044 Notes
Debt Instrument [Line Items]
Unamortized debt expense				$ 9,000,000
Senior Notes \| 2019 Notes
Debt Instrument [Line Items]
Outstanding Principal				$ 500,000,000	500,000,000
Effective interest rate percentage				2.58%
Senior Notes \| 2024 Notes
Debt Instrument [Line Items]
Outstanding Principal				$ 600,000,000	600,000,000
Effective interest rate percentage				4.02%
Senior Notes \| 2044 Notes
Debt Instrument [Line Items]
Outstanding Principal				$ 550,000,000	550,000,000
Effective interest rate percentage				5.08%
Senior Notes \| EOIT Senior Notes \| EOIT
Debt Instrument [Line Items]
Fixed interest rate percentage				6.25%
Outstanding Principal				$ 250,000,000	250,000,000
Unamortized premium				$ 14,000,000
Effective interest rate percentage				3.82%
Commercial Paper
Debt Instrument [Line Items]
Commercial paper outstanding				$ 0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,750,000,000
Number of times option maybe exercised to extend term of Term Loan Facility \| time			2
Extension period			1 year
Letters of credit principal advances				73,000,000
Letters of credit outstanding amount				$ 3,000,000
Commitment fee percentage				0.20%
Outstanding Principal				$ 73,000,000	$ 636,000,000
Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Applicable margin percentage				1.50%
Weighted average \| Revolving Credit Facility
Debt Instrument [Line Items]
Fixed interest rate percentage				2.74%

Derivative Instruments and Hedging Activities (Details) - Not Designated as Hedging Instrument
bbl in Thousands, MMBTU in Millions

9 Months Ended

Sep. 30, 2017

MMBTU

bbl

Sep. 30, 2016

MMBTU

bbl

Dec. 31, 2016

Natural Gas, Financial fixed futures/swaps | Purchases

Natural Gas, Financial fixed futures/swaps | Sales

^[1]

Natural gas, Financial basis futures/swaps | Purchases

^[1]

Natural gas, Financial basis futures/swaps | Sales

^[1]

Physical purchases/sales | Purchases

^[1]

Physical purchases/sales | Sales

^[1]

Crude oil, Financial Futures/swaps | Purchases

^[1]

Crude oil, Financial Futures/swaps | Sales

^[2]

Natural gas liquids, Financial Futures/swaps | Purchases

^[2]

490

540

Natural gas liquids, Financial Futures/swaps | Sales

^[3]

^[3]

1,701

1,133

Natural gas

Percent of contract with durations of one year or less

70.80%

100.00%

Percent of contracts with durations of more than one year and less than two years

13.00%

Percent of contracts with durations of more than two years

16.20%

Condensate

Percent of contract with durations of one year or less

87.80%

100.00%

Percent of contracts with durations of more than one year and less than two years

12.20%

Natural gas liquids

Percent of contract with durations of one year or less

79.90%

100.00%

Percent of contracts with durations of more than one year and less than two years

20.10%

[1]	As of September 30, 2017, 70.8% of the natural gas contracts had durations of one year or less, 13.0% had durations of more than one year and less than two years and 16.2% had durations of more than two years. As of December 31, 2016, 100.0% of the natural gas contracts had durations of one year or less.
[2]	As of September 30, 2017, 87.8% of the crude oil (for condensate) contracts had durations of one year or less and 12.2% had durations of more than one year and less than two years. As of December 31, 2016, 100% of the crude oil (for condensate) contracts had durations of one year or less.
[3]	As of September 30, 2017, 79.9% of the natural gas liquids contracts had durations of one year or less and 20.1% had durations of more than one year and less than two years. As of December 31, 2016, 100% of the natural gas liquid contracts had durations of one year or less.

Derivative Instruments and Hedging Activities - Balance Sheet Location (Details) - USD ($)

Sep. 30, 2017

Dec. 31, 2016

Designated as Hedging Instrument

Derivative instruments designated as cash flow hedges or fair value hedges

$ 0

Not Designated as Hedging Instrument

^[1]

7,000,000

2,000,000

Natural gas | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current, Assets

^[1]

10,000,000

34,000,000

Natural gas | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current Liabilities

4,000,000

2,000,000

Natural gas | Physical purchases/sales | Not Designated as Hedging Instrument | Other Current, Assets

3,000,000

22,000,000

Natural gas | Physical purchases/sales | Not Designated as Hedging Instrument | Other Current Liabilities

3,000,000

Crude oil (for condensate) | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current, Assets

1,000,000

Crude oil (for condensate) | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current Liabilities

Natural gas liquids | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current, Assets

1,000,000

3,000,000

Natural gas liquids | Financial futures/swaps | Not Designated as Hedging Instrument | Other Current Liabilities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 6,000,000

$ 8,000,000

[1]	See Note 9 for a reconciliation of the Partnership’s total derivatives fair value to the Partnership’s Condensed Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016.

Derivative Instruments and Hedging Activities - Amounts Recognized in Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative, net	$ (7,000,000)	$ 9,000,000	$ 23,000,000	$ (22,000,000)
Change in fair value of derivatives	(6,000,000)	8,000,000	29,000,000	(40,000,000)
Realized gain (loss) on derivatives	(1,000,000)	1,000,000	(6,000,000)	18,000,000
Gain (loss) on derivative activity	(7,000,000)	9,000,000	23,000,000	(22,000,000)
Cash collateral posted	1,000,000		1,000,000
Cash collateral required if ratings are lowered	1,000,000		1,000,000
Natural gas \| Financial futures/swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative, net	1,000,000	6,000,000	17,000,000	(5,000,000)
Natural gas \| Physical purchases/sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative, net	1,000,000	1,000,000	8,000,000	(7,000,000)
Condensate \| Financial futures/swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative, net	(2,000,000)	1,000,000	3,000,000	(2,000,000)
Natural gas liquids \| Financial futures/swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on derivative, net	$ (7,000,000)	$ 1,000,000	$ (5,000,000)	$ (8,000,000)

Fair Value Measurements - Carrying and Fair Value Amounts (Details) - Significant other observable inputs (Level 2) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Carrying Amount \| 2015 Term Loan Agreement \| 2015 Term Loan Agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2015 Term Loan Agreement (Level 2)	$ 450	$ 450
Carrying Amount \| Senior Notes \| 2019 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	500	500
Carrying Amount \| Senior Notes \| 2024 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	600	599
Carrying Amount \| Senior Notes \| 2027 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	697	0
Carrying Amount \| Senior Notes \| 2044 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	550	550
Carrying Amount \| Senior Notes \| EOIT Senior Notes \| EOIT
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	264	268
Carrying Amount \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving Credit Facility (Level 2)	73	636
Fair Value \| 2015 Term Loan Agreement \| 2015 Term Loan Agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2015 Term Loan Agreement (Level 2)	450	450
Fair Value \| Senior Notes \| 2019 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	498	490
Fair Value \| Senior Notes \| 2024 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	601	564
Fair Value \| Senior Notes \| 2027 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	716	0
Fair Value \| Senior Notes \| 2044 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	537	467
Fair Value \| Senior Notes \| EOIT Senior Notes \| EOIT
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes (Level 2)	266	260
Fair Value \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving Credit Facility (Level 2)	$ 73	$ 636

Fair Value Measurements - Fair Value Hierarchy (Details) - USD ($)
$ in Millions

Sep. 30, 2017

Dec. 31, 2016

Retained fuel due from shippers

$ 2

$ 0

Over retained fuel due from shippers

Commodity Contracts | Recurring Measurement

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets, total fair value

Liabilities, total fair value

(4)

(4)

Commodity Contracts | Recurring Measurement | Quoted market prices in active market for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Commodity Contracts | Recurring Measurement | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Commodity Contracts | Recurring Measurement | Unobservable inputs (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Gas Imbalances | Recurring Measurement

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets, total fair value

^[1],[2]

Liabilities, total fair value

^[2],[3]

^[1],[2]

^[2],[3]

^[1],[2]

^[2],[3]

Gas Imbalances | Recurring Measurement | Quoted market prices in active market for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1],[2]

Gas Imbalances | Recurring Measurement | Significant other observable inputs (Level 2)

^[2],[3]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1],[2]

Gas Imbalances | Recurring Measurement | Unobservable inputs (Level 3)

^[2],[3]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

^[1],[2]

^[2],[3]

$ 0

[1]	Gas imbalance assets exclude fuel reserves for under retained fuel due from shippers of $2 million and zero at September 30, 2017 and December 31, 2016, respectively, which fuel reserves are based on the value of natural gas at the time the imbalance was created and which are not subject to revaluation at fair market value.
[2]	The Partnership uses the market approach to fair value its gas imbalance assets and liabilities at individual, or where appropriate an average of, current market indices applicable to the Partnership’s operations, not to exceed net realizable value. Gas imbalances held by EOIT are valued using an average of the Inside FERC Gas Market Report for Panhandle Eastern Pipe Line Co. (Texas, Oklahoma Mainline), ONEOK (Oklahoma) and ANR Pipeline (Oklahoma) indices. There were no netting adjustments as of September 30, 2017 and December 31, 2016.
[3]	Gas imbalance liabilities exclude fuel reserves for over retained fuel due to shippers of zero and $5 million at September 30, 2017 and December 31, 2016, respectively, which fuel reserves are based on the value of natural gas at the time the imbalance was created and which are not subject to revaluation at fair market value.

Fair Value Measurements - Schedule of Changes in Fair Value of Level 3 Financial Instruments (Details) - Commodity Contracts - Natural gas liquids financial futures/swaps $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of December 31, 2016	$ (8)
Losses included in earnings	(5)
Settlements	7
September 30, 2017	$ (6)

Fair Value Measurements - Schedule of Quantitative Information of Level 3 Inputs (Details) - Commodity Contracts - Natural gas liquids - Market Approach Valuation Technique - Unobservable inputs (Level 3) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / gal
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liabilities \| $	$ (6)
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward Curve Range (in dollars per gallon)	0.282
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward Curve Range (in dollars per gallon)	1.081

- Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]
Interest, net of capitalized interest	$ 77	$ 67
Income taxes, net of refunds	0	1
Accounts payable related to capital expenditures	$ 52	$ 32

Supplemental Disclosure of Cash Flow Information - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 8	$ 6	$ 23
Restricted cash	14	17	0
Cash, cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 22	$ 23	$ 23	$ 4

Related Party Transactions - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Dec. 06, 2016 mi	Feb. 18, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Related Party Transaction [Line Items]
Partnership's revenues from affiliated companies as a percent of total revenues			5.00%	6.00%	5.00%	7.00%
Proceeds from issuance of Series A Preferred Units, net of issuance costs					$ 0	$ 362
Private Placement \| Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units
Related Party Transaction [Line Items]
Issuance of Series A Preferred Units, units \| shares		14,520,000
Cash purchase price (in dollars per unit) \| $ / shares		$ 25.00
Proceeds from issuance of Series A Preferred Units, net of issuance costs		$ 362
Subsidiary of Common Parent \| OGE Energy \| Transportation Agreement between OGE Energy and Enable Oklahoma Intrastate Transmission, LLC \| Pipelines
Related Party Transaction [Line Items]
Term of transportation and storage agreement	20 years
Length of pipeline (in miles) \| mi	80
Subsidiary of Common Parent \| CenterPoint \| Three Services Included in Transportation and Storage Agreements
Related Party Transaction [Line Items]
Period of written notice					180 days
CenterPoint and OGE Energy \| Minimum
Related Party Transaction [Line Items]
Period notice of termination for reimbursements for all employee costs					90 days
OGE Energy
Related Party Transaction [Line Items]
Period notice of termination prior to commencement of succeeding annual period					180 days
OGE Energy \| Minimum
Related Party Transaction [Line Items]
Period notice of termination prior to commencement of succeeding annual period					180 days
OGE Energy \| Defined Benefit and Retiree Medical Plans
Related Party Transaction [Line Items]
Expense reimbursement, 2017					$ 5
Expense reimbursement, 2018					5
Expense reimbursement, thereafter					5
OGE Energy \| Certain Services and Support Functions
Related Party Transaction [Line Items]
Expense reimbursement annual caps					4
CenterPoint
Related Party Transaction [Line Items]
Notes payable affiliated companies outstanding		$ 363
CenterPoint \| Certain Services and Support Functions
Related Party Transaction [Line Items]
Expense reimbursement annual caps					3
Affiliated Entity \| CenterPoint \| Lease Agreement with Affiliate of CenterPoint Energy
Related Party Transaction [Line Items]
Rent and maintenance expenses			$ 3		$ 3
Limited Partner \| CenterPoint \| Private Placement \| Series A 10% Fixed to Floating Non Cumulative Redeemable Perpetual Preferred Units
Related Party Transaction [Line Items]
Issuance of Series A Preferred Units, units \| shares		14,520,000
Cash purchase price (in dollars per unit) \| $ / shares		$ 25.00
Proceeds from issuance of Series A Preferred Units, net of issuance costs		$ 362

Related Party Transactions - Related Party Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Revenues from affiliated companies	$ 33	$ 36	$ 109	$ 118
Cost of goods sold from affiliate	6	4	14	9
Charges to the Partnership by affiliates	9	7	29	32
CenterPoint
Related Party Transaction [Line Items]
Cost of goods sold from affiliate	0	0	1	0
CenterPoint \| Gas Transportation and Storage
Related Party Transaction [Line Items]
Revenues from affiliated companies	22	22	79	79
CenterPoint \| Gas Sales
Related Party Transaction [Line Items]
Revenues from affiliated companies	0	0	1	1
CenterPoint \| Corporate Services
Related Party Transaction [Line Items]
Charges to the Partnership by affiliates	0	1	2	6
CenterPoint \| Operating Lease
Related Party Transaction [Line Items]
Charges to the Partnership by affiliates	1	0	1	0
OGE Energy
Related Party Transaction [Line Items]
Cost of goods sold from affiliate	6	4	13	9
OGE Energy \| Gas Transportation and Storage
Related Party Transaction [Line Items]
Revenues from affiliated companies	9	10	27	28
OGE Energy \| Gas Sales
Related Party Transaction [Line Items]
Revenues from affiliated companies	2	4	2	10
OGE Energy \| Corporate Services
Related Party Transaction [Line Items]
Charges to the Partnership by affiliates	1	1	3	4
OGE Energy \| Seconded Employee Costs
Related Party Transaction [Line Items]
Charges to the Partnership by affiliates	$ 7	$ 5	$ 23	$ 22

Equity-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Equity-Based Compensation (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 4	$ 5	$ 12	$ 10
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	3	4	8	7
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	0	1	1	2
Phantom units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 1	$ 0	$ 3	$ 1

Equity-Based Compensation - Equity Units Activity (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Performance units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Units Outstanding (in units)	1,969,107
Granted (in units)	468,626
Vested (in units)	(334,682)
Forfeited (in units)	(42,150)
Units Outstanding (in units)	2,060,901
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Units Outstanding (in dollars per unit) \| $ / shares	$ 15.27
Granted (in dollars per unit) \| $ / shares	19.27
Vested (in dollars per unit) \| $ / shares	29.61
Forfeited (in dollars per unit) \| $ / shares	14.93
Units Outstanding (in dollars per unit) \| $ / shares	$ 13.86
Aggregate Intrinsic Value of Units Outstanding \| $	$ 33
Performance units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Payout percentage	0.00%
Performance units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Payout percentage	200.00%
Performance units \| Annual Grant in 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in units)	334,682
Vested (in units)	(306,170)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Payout percentage	91.50%
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Units Outstanding (in units)	392,995
Granted (in units)	0
Vested (in units)	(149,169)
Forfeited (in units)	(8,666)
Units Outstanding (in units)	235,160
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Units Outstanding (in dollars per unit) \| $ / shares	$ 20.74
Granted (in dollars per unit) \| $ / shares	0.00
Vested (in dollars per unit) \| $ / shares	25.47
Forfeited (in dollars per unit) \| $ / shares	19.07
Units Outstanding (in dollars per unit) \| $ / shares	$ 17.81
Aggregate Intrinsic Value of Units Outstanding \| $	$ 4
Phantom units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Units Outstanding (in units)	643,604
Granted (in units)	389,209
Vested (in units)	(15,937)
Forfeited (in units)	(19,799)
Units Outstanding (in units)	997,077
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Units Outstanding (in dollars per unit) \| $ / shares	$ 8.49
Granted (in dollars per unit) \| $ / shares	16.24
Vested (in dollars per unit) \| $ / shares	13.18
Forfeited (in dollars per unit) \| $ / shares	11.42
Units Outstanding (in dollars per unit) \| $ / shares	$ 11.38
Aggregate Intrinsic Value of Units Outstanding \| $	$ 16

Equity-Based Compensation - Unrecognized Compensation Cost (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost (In millions)	$ 24
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost (In millions)	$ 15
Weighted Average to be Recognized (In years)	1 year 6 months 15 days
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost (In millions)	$ 1
Weighted Average to be Recognized (In years)	8 months 5 days
Phantom units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost (In millions)	$ 8
Weighted Average to be Recognized (In years)	1 year 9 months 29 days
Long Term Incentive Plan \| Common Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance \| shares	8,656,035

Reportable Segments - Schedule of Financial Data for Business Segments and Services (Details)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

USD ($)

Sep. 30, 2016

USD ($)

Sep. 30, 2017

USD ($)

segment

Sep. 30, 2016

USD ($)

Dec. 31, 2016

USD ($)

Number of reportable segments | segment

$ 396

$ 326

$ 1,136

$ 837

309

294

861

821

Cost of goods sold, excluding depreciation and amortization

705

620

1,997

1,658

349

268

936

717

Operation and maintenance, General and administrative

114

108

348

343

267

248

137

139

399

299

11,262

$ 11,212

Operating Segments | Gathering and Processing

102

250

289

357

295

1,044

759

185

160

469

416

Cost of goods sold, excluding depreciation and amortization

542

455

1,513

1,175

308

246

863

642

Operation and maintenance, General and administrative

215

205

167

154

241

142

8,749

7,453

Operating Segments | Transportation and Storage

176

252

^[1]

152

150

439

348

^[1]

125

135

395

408

Cost of goods sold, excluding depreciation and amortization

^[1]

277

285

834

756

^[1]

154

141

421

346

Operation and maintenance, General and administrative

^[1]

135

140

^[1]

100

^[1]

^[1]

^[1]

158

157

^[1]

5,560

4,963

^[1]

Eliminations

(113)

(119)

(347)

(270)

(1)

(3)

Cost of goods sold, excluding depreciation and amortization

(114)

(120)

(350)

(273)

(113)

(119)

(348)

(271)

Operation and maintenance, General and administrative

(1)

(2)

(3,047)

$ (1,204)