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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, 2017
Mar. 31, 2016
Gain (Loss) on Investments [Line Items]    
Other-than-temporary impairment (OTTI) losses gross $ (19) $ (71)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 8
Foreign exchange gains (losses) (19) 39
Derivative instrument 27 (284)
Fair Value Adjustments On Insurance Derivative Gains Losses 93 (228)
Net realized gains (losses) (7) (394)
Investment and embedded derivative instruments    
Gain (Loss) on Investments [Line Items]    
Derivative instrument 6 (39)
S&P put options and futures    
Gain (Loss) on Investments [Line Items]    
Derivative instrument (74) (15)
Other derivative instruments    
Gain (Loss) on Investments [Line Items]    
Derivative instrument 2 (2)
Other Investments [Member]    
Gain (Loss) on Investments [Line Items]    
OTTI on equity securities (8) (3)
Other 1 6
Equity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
OTTI on equity securities (5) (1)
Equity Securities, Gross realized gains excluding OTTI 9 40
Equity Securities, Gross realized losses excluding OTTI 0 (1)
Total equity securities 4 38
Fixed Maturities [Member]    
Gain (Loss) on Investments [Line Items]    
Other-than-temporary impairment (OTTI) losses gross (6) (67)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 8
OTTI on fixed maturities, net (6) (59)
Fixed maturities, Gross realized gains excluding OTTI 34 65
Fixed maturities, Gross realized losses excluding OTTI (40) (196)
Total fixed maturities $ (12) $ (190)