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Liability For Unpaid Claims And Claim Adjustment Expenses - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]          
Prior year incurred claims $ 20 $ (14) $ 17 $ (32)  
Liability for unpaid claims and claims adjustment expense, incurred but not reported (ibnr) claims, amount $ 8   $ 8   $ 7