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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Mar. 31, 2013 Blue Racer Line TL-404	Mar. 31, 2013 Categories of Investments, Marketable Securities, Trading Securities	Dec. 31, 2012 Categories of Investments, Marketable Securities, Trading Securities	Mar. 31, 2013 Categories of Investments, Cost-method Investments	Dec. 31, 2012 Categories of Investments, Cost-method Investments
Assets Held-in-trust		$ 98	$ 95	$ 13	$ 14
Cash proceeds from sale of midstream assets	47
Gain on sale of assets	25
After tax gain on sale of assets	$ 14

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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