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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Investments [Line Items]        
Gain (Loss) on Sale of Other Investments $ (12) $ 10 $ (60) $ 4
Net realized losses (12) (13) (71) (44)
Proceeds from Sale of Debt Securities, Available-for-sale     7,617 7,985
Transfer to Investments $ 17 $ 18 $ 17 $ 18
Investment, Type [Extensible Enumeration] Equity Securities [Member] Equity Securities [Member] Equity Securities [Member] Equity Securities [Member]
Debt Securities [Member]        
Schedule of Investments [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale $ 1,600 $ 1,500 $ 4,300 $ 4,200
Not Designated as Hedging Instrument        
Schedule of Investments [Line Items]        
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax 7 (11) (11) (5)
Non-qualifying foreign currency derivatives (5) 23 (16) 15
Realized Investment Gains Losses        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss) 28 27 45 71
Total Fixed Maturities, AFS        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 17 12 49 23
Gross losses on sales of fixed maturities (38) (62) (108) (148)
Change in ACL on fixed maturities, AFS 0 0 2 (2)
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 7 1 12 (14)
Equity Securities, FV-NI, Unrealized Gain (Loss) 20 26 40 90
Equity securities 27 27 52 76
Mortgages [Member]        
Schedule of Investments [Line Items]        
Change in ACL on mortgage loans $ (6) $ 0 $ (6) $ 3