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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, 2021
Mar. 31, 2020
Gain (Loss) on Securities [Line Items]    
Realized Investment Gains (Losses) $ 887 $ (958)
Foreign exchange gains 76 (68)
Fair Value, Option, Changes in Fair Value, Gain (Loss) 319 (685)
Gain (Loss) on Derivative 383 (547)
Other (1) 0
Fixed Maturities [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Available-for-sale, Realized Gain, Excluding Other-than-temporary Impairment 37 77
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (19) (125)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) 6 (150)
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] 0 (121)
Debt Securities, Available-for-sale, Realized Gain (Loss) 24 (319)
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) 367 (29)
Other Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Realized Investment Gains (Losses) 38 5
Other derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (1) (2)
Investment and embedded derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative 109 15
S&P put options and futures    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (44) 125
Accounting Standards Update 2016-13 [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ 4 $ 149
[1] Relates to certain securities we intended to sell and securities written to market entering default.