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Investments - Proceeds and Related Gross Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments [Abstract]        
Proceeds from sales $ 1,836 $ 2,322 $ 6,644 $ 5,203
Gross realized capital gains 15 16 37 30
Gross realized capital losses $ 27 $ 39 $ 114 $ 162