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Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Increase in income tax expense | $ 7,842 |  |  |
Effective tax rate | 27.50% | 25.40% | 48.60% |
Decrease in deferred tax liabilities | $ 946 |  |  |
Increase (decrease) in deferred tax assets | (2,780) |  |  |
Loss carryforward | 10,750 |  |  |
Tax credit carryforward | 993 |  |  |
Carry forward amount of foreign tax credit with expiration dates | 11,718 |  |  |
Existing undistributed accumulated earnings of foreign subsidiary | $ 49,200 |  |  |
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized | 82.00% |  |  |
Unrecognized tax benefits | $ 5,288 | $ 5,018 | $ 4,987 | $ 5,070
Anticipated interest and penalty obligations | (76) |  |  |
Accrued charges |  | (95) |  |
Income tax benefit expense associated with interest and penalties | $ 19 | $ (124) | $ (3) |

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