Impairment and Long-Lived Assets Pending Sale (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets and Liabilities Held for Sale [Line Items]
Assets pending sale	$ 402	$ 0
Liabilities related to assets pending sale	401	0
Signal Peak [Member]
Assets and Liabilities Held for Sale [Line Items]
Current assets	17
Property, plant and equipment	369
Deferred charges and other assets	16
Assets pending sale	402
Current liabilities	31
Long-term debt	360
Noncurrent liabilities	10
Liabilities related to assets pending sale	401
Net Assets Pending Sale	$ 1

Assets Held For Sale Net

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Liabilities of Assets Held for Sale Current

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Liabilities Of Assets Held For Sale Long Term Debt Noncurrent

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Liabilities Of Assets Held For Sale Noncurrent

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Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date.

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Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

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Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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The lower of the carrying value or fair value less cost to sell of assets held-for-sale, other than loans receivable.

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