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Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Settoon Towing, LLC	Aug. 31, 2012 Eagle Ford Pipeline LLC	Dec. 31, 2012 Eagle Ford Pipeline LLC bbl mi	Aug. 31, 2012 Eagle Ford Pipeline LLC Enterprise Product Partners	Dec. 31, 2012 Eagle Ford Pipeline LLC Enterprise Product Partners	Dec. 31, 2012 White Cliffs Pipeline, LLC	Dec. 31, 2012 Frontier Pipeline Company	Dec. 31, 2012 Butte Pipe Line Company
Equity Method of Accounting
Ownership interest (as a percent)			50.00%		50.00%			36.00%	22.00%	22.00%
Crude oil and condensate pipeline (in miles)					175
Volume of operational storage capacity (in barrels)					1,800,000
Contributed assets				$ 134		$ 15
Cash received related to formation of pipeline	59				59
Contribution to fund continued development of pipeline system	76				75		75
Asset Retirement Obligations
Fair value of asset retirement obligations	$ 31	$ 9

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Value of property contributed in noncash investing and financing activities.

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