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Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) $ 160 $ 104 $ 44 $ 3
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) 30 41 51 72
Debt Securities, Available-for-sale, Gain (Loss), Total (7) 26 (104) 75
Foreign exchange (89) 27 (154) (104)
Other (5) 1 (7) (7)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Realized Gain 69 36 107 52
Debt Securities, Available-for-Sale, Realized Loss 123 106 219 247
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) (9) (8) (1) 32
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (5) (28) (12) (62)
Other Investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) 61 132 21 300
Equity Securities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 137 21 200 24
Private equities        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) (28) 49 (17) 80
Other investments - Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) 53   0  
Reserved alternative investment fund        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 12   65  
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative 154 (17) 131 (60)
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ (2) $ (3) $ (5) $ (5)
[1] Relates to certain securities we intended to sell and securities written to market entering default.