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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) $ 104 $ (304) $ 3 $ (381)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) 41 79 72 138
Debt Securities, Available-for-sale, Gain (Loss), Total 26 (107) 75 (287)
Foreign exchange 27 (186) (104) (55)
Gain (Loss) on Derivative (41) (128) (181) (232)
Other 1 (6) (7) (13)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 36 17 52 19
Debt Securities, Available-for-Sale, Realized Loss, Excluding Other-than-temporary Impairment (106) (113) (247) (272)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) (8) 8 32 10
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (28) (19) (62) (44)
Equity Securities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 21 28 24 39
Other Investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) 132 0 300 0
Alternative Investment        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) 49 20 80 35
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (3) 2 (5) 1
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ (17) $ (55) $ (60) $ (101)
[1] Relates to certain securities we intended to sell and securities written to market entering default.