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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) $ 79 $ 61 $ 138 $ 78
Debt Securities, Available-for-sale, Gain (Loss), Total (107) (442) (287) (578)
Net realized gains (losses) (304) (503) (381) (480)
Foreign exchange (186) 270 (55) 344
Gain (Loss) on Derivative (128) 72 (232) 162
Other (6) 0 (13) (74)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 17 362 19 401
Debt Securities, Available-for-Sale, Realized Loss, Excluding Other-than-temporary Impairment (113) (700) (272) (827)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) 8 (51) 10 (63)
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (19) (53) (44) (89)
Equity Securities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 28 (263) 39 (207)
Other Investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) 20 4 35 59
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative 2 9 1 10
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ (55) $ (81) $ (101) $ (34)
[1] Relates to certain securities we intended to sell and securities written to market entering default.