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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Investments [Line Items]        
Net realized losses $ (13) $ (90) $ (44) $ (161)
Proceeds from Sale of Debt Securities, Available-for-sale     7,985 4,908
Transfer to Investments 18 0 18 0
Gain (Loss) on Sale of Other Investments $ 10 (46) $ 4 (109)
Investment, Type [Extensible Enumeration] Equity Securities [Member]   Equity Securities [Member]  
Debt Securities [Member]        
Schedule of Investments [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale $ 1,500 800 $ 4,200 2,800
Not Designated as Hedging Instrument        
Schedule of Investments [Line Items]        
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax (11) 13 (5) (3)
Non-qualifying foreign currency derivatives 23 (74) 15 (108)
Realized Investment Gains Losses        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss) 27 (14) 71 (5)
Total Fixed Maturities, AFS        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 12 6 23 26
Gross losses on sales of fixed maturities (62) (27) (148) (87)
Change in ACL on fixed maturities, AFS 0 (5) (2) (13)
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 1 1 (14) 75
Equity Securities, FV-NI, Unrealized Gain (Loss) 26 (14) 90 (43)
Equity securities 27 (13) 76 32
Mortgages [Member]        
Schedule of Investments [Line Items]        
Change in ACL on mortgage loans $ 0 $ (5) $ 3 $ (10)