Income Taxes (Details 3) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Balance, January 1 | $ 870 | $ 909 | $ 1,044 |
| Increases: | |||
| Current year tax positions | 167 | 81 | 4 |
| Tax positions related to prior years | 117 | 177 | 111 |
| Decreases: | |||
| Tax positions related to prior years | (81) | (256) | (181) |
| Settlements with tax authorities | (76) | (15) | (67) |
| Lapse of statute of limitations | (22) | (26) | (1) |
| Effects of foreign currency translations | (1) | 0 | (1) |
| Balance, December 31 | $ 974 | $ 870 | $ 909 |
| X | ||||||||||
- Definition Decrease in unrecognized tax benefits excluding amounts pertaining to examined tax returns. No definition available.
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| X | ||||||||||
- Definition Increase in unrecognized tax benefits excluding amounts pertaining to examined tax returns. No definition available.
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from foreign currency translation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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