Allocation of Net Income (Loss) and Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended		7 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 26, 2016
Allocation of net income to general partner:
Net income (loss)		$ (77)	$ 332	$ 2	$ 444
Net income applicable to pre-merger operations allocated to general partner		0	0	0	(2)
Net income applicable to noncontrolling interests		(13)	(32)	(42)	(55)
Costs charged directly to general partner		0	0	0	20
Income (loss) subject to 2% allocation of general partner interest		$ (90)	$ 300	$ (40)	$ 407
General partner's share of net income		2.00%	2.00%	2.00%	2.00%
General partner's allocated share of net income (loss) before items directly allocable to general partner interest		$ (2)	$ 6	$ (1)	$ 8
Priority allocations, including incentive distributions, paid to general partner		201	211	206	423
Pre-merger net income allocated to general partner interest		0	0	0	2
Costs charged directly to general partner		0	0	0	(20)
Net income allocated to general partner's equity		199	217	205	413
Net income (loss)		(77)	332	2	444
Net income allocated to general partner's equity		199	217	205	413
Net income (loss) allocated to Class B limited partners' equity		(8)	2	(7)	(2)
Net income allocated to Class D limited partners' equity	[1]	0	0	0	69
Net income applicable to noncontrolling interests		13	32	42	55
Net income (loss) allocated to common limited partners' equity		(281)	81	(238)	(91)
Adjustments to reconcile Net income (loss) allocated to common limited partners' equity to Allocation of net income (loss) to common units [Abstract]
Incentive distributions paid	[2]	200	211	201	423
Incentive distributions declared	[2],[3]	(210)	(209)	(410)	(421)
Impact of unit issuance timing and other		2	0	10	0
Allocation of net income (loss) to common units		$ (289)	$ 83	$ (437)	$ (89)
Distributions Made to Members or Limited Partners [Abstract]
Per Unit Distribution (Declared)		$ 0.85	$ 0.85	$ 1.7	$ 1.7
Subsequent Event [Member]
Distributions Made to Members or Limited Partners [Abstract]
Payment Date						Aug. 12, 2016
Per Unit Distribution (Declared)						$ 0.85
Class B Units Issued In Lieu Of Cash Distributions						395,207
Limited Partner [Member] | Class D [Member]
Amortization of beneficial conversion feature of Class D units					$ 68

[1] Includes amortization of the beneficial conversion feature associated with the Pre-merger WPZ Class D units of $68 million for the six months ended June 30, 2015. See following discussion of Class D units.

[2] Incentive distributions paid for the 2016 periods and Incentive distributions declared for the six months ended June 30, 2016, reflect the waiver associated with the Termination Agreement. (See Note 1 – General, Description of Business, and Basis of Presentation.)

[3] The Board of Directors of our general partner declared a cash distribution of $0.85 per common unit on July 26, 2016, to be paid on August 12, 2016, to unitholders of record at the close of business on August 5, 2016.