Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Interim Tax Expense (Benefit)
Effective tax rate on pretax income from continuing operations (as a percent)	(15.90%)	66.90%	(114.60%)	17.80%
U.S. federal income tax at statutory rate (as a percent)	35.00%		35.00%
Valuation allowance					$ 23,800,000,000
Accounting for Uncertainty in Income Taxes
Unrecognized tax benefits, excluding interest and penalties	5,100,000,000		5,100,000,000		5,300,000,000
Unrecognized tax benefits, if recognized would not affect the effective tax rate	1,400,000,000		1,400,000,000		1,700,000,000
Unrecognized tax benefits, if recognized would favorably affect the effective tax rate	3,700,000,000		3,700,000,000		3,600,000,000
Unrecognized tax benefits, tax penalties and interest accrued	845,000,000		845,000,000		952,000,000
Unrecognized tax benefits, tax penalties and interest			$ (107,000,000)	$ 78,000,000
Unrecognized tax benefits, period of reasonably possible change in balance (in months)			12

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The total amount of unrecognized tax benefits that, if recognized, would not affect the effective tax rate.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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A statement that a range of reasonably possible change cannot be made for a tax position taken for which it is reasonably possible that the total amount of unrecognized tax benefit will significantly increase or decrease within 12 months of the balance sheet date.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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