CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Common Units	General Partner	Partners' Capital Excluding Noncontrolling Interests	Noncontrolling Interests	Total
Balance, beginning of period at Dec. 31, 2013	$ 7,349	$ 295	$ 7,644	$ 59	$ 7,703
Balance, beginning of period (in units) at Dec. 31, 2013	359,100,000
Increase (Decrease) in Partners' Capital
Net income	$ 630	364	994	2	996
Distributions	(688)	(344)	(1,032)	(2)	(1,034)
Issuance of common units	$ 655	14	669		669
Issuance of common units (in units)	11,800,000
Issuance of common units under LTIP	$ 1	1	2		2
Issuance of common units under LTIP (in units)	600,000
Settlement of employee income tax withholding obligations under LTIP	$ (19)		(19)		(19)
Equity-indexed compensation expense	25	5	30		30
Distribution equivalent right payments	(5)		(5)		(5)
Other comprehensive loss	(207)	(4)	(211)		(211)
Other	(1)		(1)		(1)
Balance, end of period at Sep. 30, 2014	$ 7,740	331	8,071	59	8,130
Balance, end of period (in units) at Sep. 30, 2014	371,500,000
Balance, beginning of period at Dec. 31, 2014	$ 7,793	340	8,133	58	$ 8,191
Balance, beginning of period (in units) at Dec. 31, 2014	375,100,000				375,107,793
Increase (Decrease) in Partners' Capital
Net income	$ 215	442	657	2	$ 659
Distributions	(802)	(436)	(1,238)	(2)	(1,240)
Issuance of common units	$ 1,099	22	1,121		1,121
Issuance of common units (in units)	22,100,000
Issuance of common units under LTIP		1	1		1
Issuance of common units under LTIP (in units)	500,000
Settlement of employee income tax withholding obligations under LTIP	$ (13)		(13)		(13)
Equity-indexed compensation expense	19	1	20		20
Distribution equivalent right payments	(5)		(5)		(5)
Other comprehensive loss	(507)	(11)	(518)		(518)
Balance, end of period at Sep. 30, 2015	$ 7,799	$ 359	$ 8,158	$ 58	$ 8,216
Balance, end of period (in units) at Sep. 30, 2015	397,700,000				397,727,624