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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross $ (4) $ (9) $ (5) $ (28)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 1 0 1
Net gains (losses) recognized during the period (13)   5  
Foreign exchange gains (losses) 140 14 63 (5)
Derivative instrument 29 63 108 90
Fair Value Adjustments On Insurance Derivative Gains Losses 41 118 79 211
Net realized gains (losses) 18 101 16 94
Investment and embedded derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument 24 (16) 41 (10)
S&P put options and futures        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (44) (38) (22) (112)
Other derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument 8 (1) 10 1
Fixed Maturities [Member]        
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross (4) (5) (5) (11)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 1 0 1
OTTI on fixed maturities, net (4) (4) (5) (10)
Fixed maturities, Gross realized gains excluding OTTI 99 45 165 79
Fixed maturities, Gross realized losses excluding OTTI (176) (18) (264) (58)
Total fixed maturities (81) 23 (104) 11
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities 0 (3) 0 (8)
Net gains (losses) recognized during the period (2)   (13)  
Equity Securities, Gross realized gains excluding OTTI 6 6 16 15
Equity Securities, Gross realized losses excluding OTTI (8) (1) (29) (1)
Total equity securities (2) 2 (13) 6
Other Investments [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities 0 (1) 0 (9)
Net gains (losses) recognized during the period (11) 0 18 0
Other $ (57) $ 0 $ (56) $ 1