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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
Mar. 31, 2024
Mar. 31, 2023
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) $ (101) $ (77)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) 31 59
Debt Securities, Available-for-sale, Gain (Loss), Total 49 (180)
Foreign exchange (131) 131
Gain (Loss) on Derivative (140) (104)
Other (8) (7)
Fixed Maturities [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 16 2
Debt Securities, Available-for-Sale, Realized Loss, Excluding Other-than-temporary Impairment (141) (159)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) 40 2
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (34) (25)
Equity Securities    
Gain (Loss) on Securities [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) 3 11
Other Investments    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) 168 0
Alternative Investment    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) 31 15
Other derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (2) (1)
Investment and embedded derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative $ (43) $ (46)
[1] Relates to certain securities we intended to sell and securities written to market entering default.