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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross $ (8) $ (12) $ (36) $ (99)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 0 1 8
Foreign exchange gains 15 29 10 46
Derivative instrument (22) 48 68 (442)
Fair Value Adjustments On Insurance Derivative Gains Losses 54 89 265 (270)
Net realized gains (losses) (10) 100 84 (510)
Investment and embedded derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (14) 1 (24) (85)
S&P put options and futures        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (57) (45) (169) (88)
Other derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (5) 3 (4) 1
Fixed Maturities [Member]        
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross (5) (7) (16) (85)
OTTI on fixed maturities recognized in OCI (pre-tax) 0 0 1 8
OTTI on fixed maturities, net (5) (7) (15) (77)
Fixed maturities, Gross realized gains excluding OTTI 30 47 109 149
Fixed maturities, Gross realized losses excluding OTTI (19) (13) (77) (228)
Total fixed maturities 6 27 17 (156)
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities (1) (1) (9) (7)
Equity Securities, Gross realized gains excluding OTTI 6 19 21 63
Equity Securities, Gross realized losses excluding OTTI (1) (12) (2) (17)
Total equity securities 4 6 10 39
Other Investments [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities (2) (4) (11) (7)
Other $ (11) $ (6) $ (10) $ 10