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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