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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Investments [Line Items]        
Net realized losses $ (10) $ (59) $ (59) $ (31)
Proceeds from Sale of Debt Securities, Available-for-sale     4,755 5,151
Transfer to Investments 0 0 0 0
Gain (Loss) on Sale of Other Investments (20) (3) (48) (6)
Debt Securities [Member]        
Schedule of Investments [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale 1,700 2,300 2,700 2,700
Not Designated as Hedging Instrument        
Schedule of Investments [Line Items]        
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax (8) 4 (18) 6
Non-qualifying foreign currency derivatives (11) (6) (11) (8)
Realized Investment Gains Losses        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss) 34 15 21 44
Total Fixed Maturities, AFS        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 19 6 32 11
Gross losses on sales of fixed maturities (45) (75) (70) (86)
Change in ACL on fixed maturities, AFS 0 (1) 2 (2)
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 5 (3) 5 (15)
Equity Securities, FV-NI, Unrealized Gain (Loss) 31 17 20 64
Equity securities 36 14 25 49
Mortgages [Member]        
Schedule of Investments [Line Items]        
Change in ACL on mortgage loans $ 0 $ 0 $ 0 $ 3