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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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