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Disposals and Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Productive Assets	$ 23
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	5
Goodwill, Written off Related to Sale of Business Unit	4
Gross Proceeds From Sale of Gathering and Processing Assets		45
Goodwill of Gathering and Processing Assets		$ 13

- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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