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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, 2020
Mar. 31, 2019
Gain (Loss) on Securities [Line Items]    
OTTI on fixed maturities, gross $ 0 $ (13)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) 149  
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (121) 0
Foreign exchange gains (68) 13
Gain (Loss) on Derivative (547) (80)
Net Realized Gains (Losses) (958) (97)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities 0 0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings 0 (13)
Fair Value, Option, Changes in Fair Value, Gain (Loss) (685) 114
Investment and embedded derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative 15 (130)
S&P put options and futures    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative 125 (63)
Other derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (2) (1)
Fixed Maturities [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Available-for-sale, Realized Gain, Excluding Other-than-temporary Impairment 77 27
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (125) (58)
Debt Securities, Available-for-sale, Realized Gain (Loss) (319) (44)
Debt Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings 0 (13)
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) (29) 58
Other Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Other investments gain (loss) 5 (44)
Accounting Standards Update 2016-13 [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ (150) $ 0
[1] Related to our intent to sell certain securities.