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, 2012	$ 7,146	$ 6,388	$ 249	$ 6,637	$ 509
Balance (in units) at Dec. 31, 2012	335,283,874	335,300,000
Increase (Decrease) in Partners' Capital
Net income	1,074	764	288	1,052	22
Distributions	(892)	(585)	(270)	(855)	(37)
Issuance of common units	400	392	8	400
Issuance of common units (in units)		7,200,000
Issuance of common units under LTIP	4	4		4
Issuance of common units under LTIP (in units)		800,000
Units tendered by employees to satisfy tax withholding obligations	(15)	(15)		(15)
Units tendered by employees to satisfy tax withholding obligations (in units)		(300,000)
Equity-indexed compensation expense	31	24	4	28	3
Distribution equivalent right payments	(4)	(4)		(4)
Issuance of PNG common units	40	8		8	32
Other	(1)	(1)		(1)
Other comprehensive income/(loss)	(99)	(102)	(2)	(104)	5
Balance at Sep. 30, 2013	7,684	6,873	277	7,150	534
Balance (in units) at Sep. 30, 2013	342,950,166	343,000,000
Balance at Jun. 30, 2013
Increase (Decrease) in Partners' Capital
Net income	237
Issuance of PNG common units				2
Other comprehensive income/(loss)	39
Balance at Sep. 30, 2013	$ 7,684			$ 7,150
Balance (in units) at Sep. 30, 2013	342,950,166