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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule of Investments [Line Items]        
Net realized losses $ (59) $ (64) $ (31) $ (71)
Proceeds from Sale of Debt Securities, Available-for-sale     5,151 3,507
Debt Securities [Member]        
Schedule of Investments [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale 2,300 600 2,700 2,000
Not Designated as Hedging Instrument        
Schedule of Investments [Line Items]        
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax 4 (9) 6 (16)
Non-qualifying foreign currency derivatives (6) (39) (8) (34)
Realized Investment Gains Losses        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss) 15 7 44 7
Other, net        
Schedule of Investments [Line Items]        
Other, net (3) (48) (6) (63)
Total Fixed Maturities, AFS        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 6 3 11 20
Gross losses on sales of fixed maturities (75) (21) (86) (60)
Change in ACL on fixed maturities, AFS (1) (3) (2) (8)
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) (3) 24 (15) 74
Equity Securities, FV-NI, Unrealized Gain (Loss) 17 (14) 64 (29)
Equity securities 14 10 49 45
Mortgages [Member]        
Schedule of Investments [Line Items]        
Change in ACL on mortgage loans $ 0 $ (5) $ 3 $ (5)