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Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery $ 0 $ 0 $ (3)
Other, net 32 (118) 11
Total net realized capital gains (losses) (61) (188) (627)
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax $ 20 $ (15) 28
Investment, Type [Extensible Enumeration] Equity Securities [Member] Equity Securities [Member]  
Transfer to Investments $ 18 $ 80  
Non-qualifying      
Schedule of Investments [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 13 (108) 46
Realized Investment Gains Losses      
Schedule of Investments [Line Items]      
Equity Securities, FV-NI, Unrealized Gain (Loss) 68 17 (108)
Total fixed maturities      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-Sale, Realized Gain 31 30 57
Debt Securities, Available-for-sale, Realized Loss (198) (149) (315)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) (2) (14) (18)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery 0 0 6
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) (11) 100 (83)
Equity Securities, FV-NI, Unrealized Gain (Loss) 84 (22) (266)
Debt and Equity Securities, Gain (Loss) 73 78 (349)
Mortgage loans      
Schedule of Investments [Line Items]      
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) $ 3 $ (15) $ (7)