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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Investments [Line Items]    
Net realized gains (losses) $ (49) $ 28
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax (10) 2
Proceeds from Sale of Debt Securities, Available-for-sale 2,126 1,548
Transfer to Investments 0 0
Gain (Loss) on Sale of Other Investments (28) (3)
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Proceeds from Sale of Debt Securities, Available-for-sale 1,000 400
Not Designated as Hedging Instrument    
Schedule of Investments [Line Items]    
Non-qualifying foreign currency derivatives 0 (2)
Realized Investment Gains Losses    
Schedule of Investments [Line Items]    
Equity Securities, FV-NI, Unrealized Gain (Loss) (11) 36
Total Fixed Maturities, AFS    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Realized Gain 13 5
Gross losses on sales of fixed maturities (25) (11)
Change in ACL on fixed maturities, AFS 2 (1)
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) 0 (12)
Equity Securities, FV-NI, Unrealized Gain (Loss) (11) 47
Equity securities (11) 35
Mortgages [Member]    
Schedule of Investments [Line Items]    
Change in ACL on mortgage loans $ 0 $ 3