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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Tax Disclosure [Abstract]        
Tax provision at U.S. federal statutory rate $ 261 $ 192 $ 426 $ 383
Nontaxable net investment income (9) (11) (14) (22)
Other 1 7 8 29
Income tax expense $ 251 $ 174 $ 404 $ 332