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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2019 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Examination [Line Items] |  |  |  |  |
Income tax rate | 31.20% | 31.00% |  | 34.80% | 52.60%
IRS |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Possible increase in U.S. taxable income | $ 1,232 |  | $ 696 |  |
Possible additional federal tax expense | 431 |  | $ 244 |  |
Liability adjustment for tax expense | $ 120 |  |  | $ 120 |
Payments for legal settlements |  |  |  | 113 |
Tax provision |  |  |  | $ 67 |

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