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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Net income tax payments/(refunds) | $ 204 | $ (1,317) | $ (1,480)
Deferred tax assets | 14,743 | 12,301 |
Deferred tax liabilities | 10,363 | 9,306 |
Valuation allowance | 4,550 | 3,162 |
Valuation allowance, deferred tax asset, increase (decrease), amount | 1,388 |  |
Federal, state, and local, income tax expense (benefit), increase (decrease), amount | (31) |  |
Unrecognized tax benefits that would affect the effective tax rate, if recognized | 1,088 | $ 878 | $ 790
Decrease in unrecognized tax benefits is reasonably possible | 620 |  |
Continuing Operations |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Valuation allowance | 1,150 |  |
Other Comprehensive Income (Loss) |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Valuation allowance | 173 |  |
Additional Paid-In Capital |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Valuation allowance | $ 34 |  |

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