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Divestitures (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Divestitures [Abstract] | |||
| Proceeds from Sales of Producing Properties and Acreage | $ 1,300 | $ 1,400 | $ 673 |
| Assets Held-for-sale, at Carrying Value, Total | 310 | ||
| Liabilities of Assets Held-for-sale | 31 | ||
| Proceeds received on sale of Canadian shallow gas assets | 344 | ||
| Impairment recorded to adjust Canadian shallow gas assets to fair value, less cost to sell | $ 280 | ||
| X | ||||||||||
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- Definition
Estimated proceeds from the sale of producing properties and acreage. No definition available.
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| X | ||||||||||
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- Definition
Impairment recorded to adjust Canadian shallow gas assets to fair value, less cost to sell No definition available.
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| X | ||||||||||
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- Definition
The value of all consideration received by the Entity in the sale of Canadian shallow natural gas assets. No definition available.
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| X | ||||||||||
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- Definition
Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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