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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross $ (9) $ (16) $ (28) $ (87)
OTTI on fixed maturities recognized in OCI (pre-tax) 1 0 1 8
Foreign exchange gains (losses) 14 (22) (5) 17
Derivative instrument 63 (206) 90 (490)
Fair Value Adjustments On Insurance Derivative Gains Losses 118 (131) 211 (359)
Net realized gains (losses) 101 (216) 94 (610)
Investment and embedded derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (16) (47) (10) (86)
S&P put options and futures        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (38) (28) (112) (43)
Other derivative instruments        
Gain (Loss) on Investments [Line Items]        
Derivative instrument (1) 0 1 (2)
Other Investments [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities (1) 0 (9) (3)
Other 0 10 1 16
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
OTTI on equity securities (3) (5) (8) (6)
Equity Securities, Gross realized gains excluding OTTI 6 4 15 44
Equity Securities, Gross realized losses excluding OTTI (1) (4) (1) (5)
Total equity securities 2 (5) 6 33
Fixed Maturities [Member]        
Gain (Loss) on Investments [Line Items]        
Other-than-temporary impairment (OTTI) losses gross (5) (11) (11) (78)
OTTI on fixed maturities recognized in OCI (pre-tax) 1 0 1 8
OTTI on fixed maturities, net (4) (11) (10) (70)
Fixed maturities, Gross realized gains excluding OTTI 45 37 79 102
Fixed maturities, Gross realized losses excluding OTTI (18) (19) (58) (215)
Total fixed maturities $ 23 $ 7 $ 11 $ (183)