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Summary of Significant Accounting Policies (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended												12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Nexen Acquisition	Dec. 31, 2011 Southern Pines Acquisition	Dec. 31, 2011 Gardendale Gathering System Acquisition	Dec. 31, 2011 Transportation	Dec. 31, 2010 Transportation	Dec. 31, 2010 Transportation Nexen Acquisition	Dec. 31, 2011 Transportation Gardendale Gathering System Acquisition	Dec. 31, 2011 Facilities	Dec. 31, 2010 Facilities	Dec. 31, 2009 Facilities	Dec. 31, 2011 Facilities Southern Pines Acquisition	Dec. 31, 2011 Supply and Logistics	Dec. 31, 2010 Supply and Logistics	Dec. 31, 2010 Supply and Logistics Nexen Acquisition
Changes in goodwill
Balance at beginning of period	$ 1,376	$ 1,287				$ 640	$ 608			$ 609	$ 308	$ 308		$ 428	$ 371
Acquisitions			72	301	155			18	155				301			54
Purchase accounting adjustments		3					3
Purchase price accounting adjustments and other	28					28
Foreign currency translation adjustments	(6)	14				(5)	11							(1)	3
Balance at end of period	1,854	1,376				818	640			609	308	308		427	428
Accumulated impairment losses	$ 3

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