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Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Increase in income tax expense | $ 5,893 |  |  |
Effective tax rate | 27.60% | 28.30% | 27.50% |
Decrease in deferred tax liabilities | $ 1,779 |  |  |
Decrease in deferred tax assets | (628) |  |  |
Loss carryforward | 9,600 |  |  |
Tax credit carryforward | 260 |  |  |
Carry forward amount of foreign tax credit with expiration dates | $ 13,560 |  |  |
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized | 79.00% |  |  |
Unrecognized tax benefits | $ 5,452 | $ 5,323 | $ 5,288 | $ 5,018
Anticipated interest and penalty obligations | 229 |  |  |
Accrued benefit for interest and penalties |  | 112 |  |
Income tax benefit expense associated with interest and penalties | $ 124 | $ 152 | $ 19 |

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