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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Gain (Loss) on Securities [Line Items]        
OTTI on fixed maturities, gross $ 0 $ (14) $ 0 $ (27)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) 29   178  
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell (31) [1] 0 [1] (152) [1] 0
Foreign exchange gains (61) (11) (129) 2
Gain (Loss) on Derivative 123 (259) (424) (339)
Other (40) 0 (40) 0
Net Realized Gains (Losses) 30 (223) (928) (320)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities 0 1 0 1
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings 0 (13) 0 (26)
Fair Value, Option, Changes in Fair Value, Gain (Loss) 213 (65) (472) 49
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent 0 1   1
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative 14 (181) 29 (311)
S&P put options and futures        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (103) (20) 22 (83)
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (1) 7 (3) 6
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
OTTI on fixed maturities, gross   14 0 27
Debt Securities, Available-for-sale, Realized Gain, Excluding Other-than-temporary Impairment 68 56 145 83
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (174) (31) (299) (89)
Debt Securities, Available-for-sale, Realized Gain (Loss) (33) 12 (352) (32)
Debt Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings   (13) 0 (26)
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) 148 5 119 63
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Other investments gain (loss) (107) 30 (102) (14)
Accounting Standards Update 2016-13 [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ 104 $ 0 $ (46) $ 0
[1] Relates to certain securities we intended to sell and securities written to market entering default.