Condensed Consolidated Statement of Partners' Capital and Noncontrolling Interest (USD $) In Millions	Total	Class F Units [Member]	Common Units [Member]	General Partner Interest	Predecessor Equity [Member]	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Balance at Dec. 31, 2012	$ 5,340	$ 0	$ 3,207	$ 326	$ 1,733	$ (3)	$ 77
Contribution of net investment to the Partnership	0	0	0	1,927	(1,930)	3	0
Issuance of common units in connection with the SUGS Acquisition, net of costs	0	0	819	(819)	0	0	0
Issuance of Class F common units in connection with the SUGS Acquisition, net of costs	0	142	0	(142)	0	0	0
Contribution of assets between entities under common control below historical cost	(262)	0	0	(492)	230	0	0
Issuance of common units under equity distribution program, net of costs	128	0	128	0	0	0	0
Unit-based compensation expenses	3	0	3	0	0	0	0
Partner distributions	(179)	0	172	7	0	0	0
Distributions on unvested unit awards	(1)	0	(1)	0	0	0	0
Contribution from noncontrolling interest	12	0	0	0	0	0	12
Net income (loss)	(18)	1	8	5	(33)	0	1
Distributions to Series A convertible redeemable preferred units	(4)	0	(4)	0	0	0	0
Balance at Jun. 30, 2013	$ 5,019	$ 143	$ 3,988	$ 798	$ 0	$ 0	$ 90