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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Tax Disclosure [Abstract]    
Tax provision at U.S. federal statutory rate $ 165 $ 191
Nontaxable net investment income (5) (11)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 0 (12)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount (12) (16)
Other (5) (6)
Income tax expense $ 153 $ 158