Taxes - Unrecognized Tax Benefits Reconciliation (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Taxes | |||
| Increase (decrease) in amount of unrecognized tax benefits | $ 1,422 | ||
| Reconciliation of the beginning and ending amount of unrecognized tax benefits | |||
| Balance at January 1 | 7,146 | $ 6,759 | $ 7,031 |
| Additions based on tax positions related to the current year | 1,690 | 816 | 394 |
| Additions for tax positions of prior years | 159 | 779 | 1,201 |
| Reductions for tax positions of prior years (including impacts due to a lapse of statute) | (408) | (922) | (1,686) |
| Settlements | (19) | (286) | (181) |
| Balance at December 31 | $ 8,568 | $ 7,146 | $ 6,759 |
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- References 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/disclosureRef
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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/disclosureRef
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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/disclosureRef
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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/disclosureRef
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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/disclosureRef
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- Definition Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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