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Liability For Unpaid Claims And Claim Adjustment Expenses - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]          
Prior year incurred claims $ 18 $ (7) $ 35 $ (39)  
Liability for unpaid claims and claims adjustment expense, incurred but not reported (ibnr) claims, amount $ 7   $ 7   $ 7