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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, 2019
Mar. 31, 2018
Gain (Loss) on Securities [Line Items]    
OTTI on fixed maturities, gross and net $ 13 $ 1
Foreign exchange gains (losses) 13 (77)
Gain (Loss) on Derivative (80) 79
Fair Value Adjustments On Insurance Derivative Gains Losses 114 38
Net Realized Gains (Losses) (97) (2)
Investment and embedded derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (130) 17
S&P put options and futures    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (63) 22
Other derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative (1) 2
Fixed Maturities [Member]    
Gain (Loss) on Securities [Line Items]    
OTTI on fixed maturities, gross and net (13) (1)
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment 27 66
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment (58) (88)
Debt Securities, Available-for-sale, Realized Gain (Loss) (44) (23)
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Equity Securities, FV-NI, Realized Gain 64 10
Equity Securities, FV-NI, Realized Loss (6) (21)
Equity Securities, FV-NI, Realized Gain (Loss) 58 (11)
Other Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Other investments gain (loss) (44) 29
Other [Member]    
Gain (Loss) on Securities [Line Items]    
Other $ 0 $ 1