CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Units	General Partner	Partners' Capital Excluding Noncontrolling Interests	Noncontrolling Interests
Balance at Dec. 31, 2011	$ 5,974	$ 5,249	$ 201	$ 5,450	$ 524
Balance (in units) at Dec. 31, 2011	310,753,874	310,800,000
Increase (Decrease) in Partners' Capital
Net income	797	554	220	774	23
Distributions	(746)	(502)	(208)	(710)	(36)
Issuance of common units	812	796	16	812
Issuance of common units (in units)		19,900,000
Issuance of common units under LTIP	34	33	1	34
Issuance of common units under LTIP (in units)		900,000
Equity compensation expense	23	14	6	20	3
Distribution equivalent right payments	(4)	(3)		(3)	(1)
Other comprehensive income/(loss)	35	42	1	43	(8)
Balance at Sep. 30, 2012	$ 6,925	$ 6,183	$ 237	$ 6,420	$ 505
Balance (in units) at Sep. 30, 2012	331,619,386	331,600,000