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Available-for-sale Fixed Maturity Securities - Proceeds from Sales of Available-for-Sale Fixed Maturity Securities with Related Gross Realized Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of available-for-sale fixed maturity securities $ 3,533 $ 1,820 $ 4,881 $ 2,413
Gross realized gains 8 2 10 4
Gross realized (losses) $ (61) $ (21) $ (62) $ (23)