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	$ 435	236	671	1	672
Distributions	(450)	(222)	(672)	(1)	(673)
Issuance of common units	$ 444	9	453		453
Issuance of common units (in units)	8,100,000
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 obligation under LTIP	$ (19)		(19)		(19)
Equity-indexed compensation expense	19	4	23		23
Distribution equivalent right payments	(3)		(3)		(3)
Other comprehensive loss	(44)	(1)	(45)		(45)
Other	(1)		(1)		(1)
Balance, end of period at Jun. 30, 2014	$ 7,731	322	8,053	59	8,112
Balance, end of period (in units) at Jun. 30, 2014	367,800,000
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	$ 116	291	407	1	$ 408
Distributions	(526)	(284)	(810)	(1)	(811)
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 obligation under LTIP	$ (13)		(13)		(13)
Equity-indexed compensation expense	16	1	17		17
Distribution equivalent right payments	(3)		(3)		(3)
Other comprehensive loss	(202)	(4)	(206)		(206)
Balance, end of period at Jun. 30, 2015	$ 8,280	$ 367	$ 8,647	$ 58	$ 8,705
Balance, end of period (in units) at Jun. 30, 2015	397,700,000				397,680,214