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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gain (Loss) on Securities [Line Items]        
OTTI on fixed maturities, gross $ 14 $ 8 $ 19 $ 36
OTTI on fixed maturities recognized in OCI (pre-tax) 3 0 3 1
Cost-method Investments, Realized Gain (Loss) 19 (10) 35 84
Foreign exchange gains (losses) 39 15 102 10
Gain (Loss) on Derivative (17) (22) 91 68
Fair Value Adjustments On Insurance Derivative Gains Losses 54 54 133 265
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative 37 (14) 78 (24)
S&P put options and futures        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (100) (57) (122) (169)
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (8) (5) 2 (4)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
OTTI on fixed maturities, gross (14) (5) (19) (16)
OTTI on fixed maturities recognized in OCI (pre-tax) 3 0 3 1
OTTI on fixed maturities, net (11) (5) (16) (15)
Gross realized gains excluding OTTI 64 30 229 109
Gross realized losses excluding OTTI (91) (19) (355) (77)
Total fixed maturities (38) 6 (142) 17
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Cost-method Investments, Other than Temporary Impairment 0 (1) 0 (9)
Equity Securities, Gross realized gains excluding OTTI 48 6 63 21
Equity Securities, Gross realized losses excluding OTTI (13) (1) (41) (2)
Cost-method Investments, Realized Gain (Loss) 35 4 22 10
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Cost-method Investments, Other than Temporary Impairment 0 (2) 0 (11)
Cost-method Investments, Realized Gain (Loss) 5 0 23 0
Other $ (5) $ (11) $ (61) $ (10)