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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of period | $ 1,341 | $ 1,557 | $ 1,182
Additions to current year tax positions | 18 | 292 | 160
Additions to prior years' tax positions | 13 | 264 | 448
Reductions to prior years' tax positions | (501) | (244) | (195)
Reductions in tax positions due to lapse of statutory limitations | (8) | (38) | (44)
Settlements | (93) | (450) | (11)
Other | 5 | (40) | 17
Balance at end of period | 775 | 1,341 | 1,557
Unrecognized tax benefit that would favorably affect effective tax rate | 539 | 991 |
Income tax related interest and penalties accrual | 117 | 116 |
Operating Loss Carryforwards [Line Items] |  |  |
Tax expense related to tax reform legislation |  |  | 7,300
Tax expense related to tax reform legislation, updated |  |  | $ 7,100
Germany | Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 3,300 |  |
Deferred tax assets |  | $ 1,000 |

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