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	1,925	(1,928)	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	(273)	0	0	(504)	231	0	0
Common units issued under equity distribution program, net of costs	149	0	149	0	0	0	0
Conversion of Stock, Amount Converted	41	0	41	0	0	0	0
Unit-based compensation expenses	5	0	5	0	0	0	0
Partner distributions	(280)	0	269	11	0	0	0
Distributions on unvested unit awards	(2)	0	(2)	0	0	0	0
Contributions from noncontrolling interest	15	0	0	0	0	0	15
Net income (loss)	24	3	45	8	(36)	0	4
Distributions to Series A Preferred Units	(5)	0	(5)	0	0	0	0
Balance at Sep. 30, 2013	$ 5,014	$ 145	$ 3,990	$ 783	$ 0	$ 0	$ 96