Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions |
3 Months Ended |
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Mar. 31, 2018
USD ($)
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Reconciliation of Unrecognized Tax Benefits [Roll Forward] | |
Balance at beginning of year | $ 1,409 |
Reductions due to acquisitions | (9) |
Additions for tax positions of current year | 1 |
Additions for tax positions of prior years | 1 |
Reductions for tax positions of prior years | (84) |
Settlements | (45) |
Balance at end of year | $ 1,273 |
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- Definition Amount of increase (decrease) in unrecognized tax benefits resulting from settlements with taxing authorities. No definition available.
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- 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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- 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 acquisitions. No definition available.
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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 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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- 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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