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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Tax provision at U.S. federal statutory rate | $ 192 | $ 141 | $ 383 | $ 278
Nontaxable investment income | (11) | (9) | (22) | (20)
Other | 7 | 7 | 29 | 15
Income tax expense | $ 174 | $ 125 | $ 332 | $ 243

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