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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) (USD $)
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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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| Reconciliation of unrecognized tax benefits | ||||||||
| Beginning balance | $ 1,547,000,000 | $ 2,261,000,000 | $ 1,714,000,000 | |||||
| Increases related to positions taken during the current year | 52,000,000 | 38,000,000 | 97,000,000 | |||||
| Increases related to positions taken during prior years(1) | 37,000,000 | [1] | 450,000,000 | [1] | 520,000,000 | [1] | ||
| Decreases related to positions taken during prior years(1) | (181,000,000) | [1] | (967,000,000) | [1] | (51,000,000) | [1] | ||
| Settlements | (9,000,000) | (152,000,000) | (3,000,000) | |||||
| Expiration of statute of limitations | (31,000,000) | (83,000,000) | (16,000,000) | |||||
| Ending balance | 1,415,000,000 | 1,547,000,000 | 2,261,000,000 | |||||
| Unrecognized tax benefits that would impact effective tax rate | $ 1,100,000,000 | $ 1,200,000,000 | $ 1,300,000,000 | |||||
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- Details
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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