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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, 2018
Mar. 31, 2017
Gain (Loss) on Investments [Line Items]    
Other-than-temporary impairment (OTTI) losses gross $ (1) $ (19)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 0
Foreign exchange gains (77) (19)
Derivative instrument 79 27
Fair Value Adjustments On Insurance Derivative Gains Losses 38 93
Net realized gains (losses) (2) (7)
Investment and embedded derivative instruments    
Gain (Loss) on Investments [Line Items]    
Derivative instrument 17 6
S&P put options and futures    
Gain (Loss) on Investments [Line Items]    
Derivative instrument 22 (74)
Other derivative instruments    
Gain (Loss) on Investments [Line Items]    
Derivative instrument 2 2
Fixed Maturities [Member]    
Gain (Loss) on Investments [Line Items]    
Other-than-temporary impairment (OTTI) losses gross (1) (6)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 0
OTTI on fixed maturities, net (1) (6)
Fixed maturities, Gross realized gains excluding OTTI 66 34
Fixed maturities, Gross realized losses excluding OTTI (88) (40)
Total fixed maturities (23) (12)
Equity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
OTTI on equity securities 0 (5)
Realized Investment Gains (Losses) (11)  
Equity Securities, Gross realized gains excluding OTTI 10 9
Equity Securities, Gross realized losses excluding OTTI (21) 0
Total equity securities (11) 4
Other Investments [Member]    
Gain (Loss) on Investments [Line Items]    
OTTI on equity securities 0 (8)
Realized Investment Gains (Losses) 29 0
Other $ 1 $ 1