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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
OTTI on fixed maturities, gross | $ (54) | $ (14) | $ (81) | $ (19)
Foreign exchange gains | 84 | 39 | 86 | 102
Gain (Loss) on Derivative | (223) | (17) | (562) | 91
Fair Value Adjustments On Insurance Derivative Gains Losses | (106) | 54 | (57) | 133
Net Realized Gains (Losses) | (155) | 19 | (475) | 35
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities | 30 | 3 | 31 | 3
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings | (24) | (11) | (50) | (16)
Investment and embedded derivative instruments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gain (Loss) on Derivative | (97) | 37 | (408) | 78
S&P put options and futures |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gain (Loss) on Derivative | (6) | (100) | (89) | (122)
Other derivative instruments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gain (Loss) on Derivative | (14) | (8) | (8) | 2
Fixed Maturities [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
OTTI on fixed maturities, gross | (54) | (14) | (81) | (19)
Debt Securities, Available-for-sale, Realized Gain, Excluding Other-than-temporary Impairment | 70 | 64 | 153 | 229
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment | (57) | (91) | (146) | (355)
Debt Securities, Available-for-sale, Realized Gain (Loss) | (11) | (38) | (43) | (142)
Debt Securities [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities | 30 | 3 | 31 | 3
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings | (24) | (11) | (50) | (16)
Equity Securities [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity Securities, FV-NI, Realized Gain (Loss) | 3 | 35 | 66 | 22
Other Investments [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other investments gain (loss) | (4) | 5 | (18) | 23
Other [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other | $ (4) | $ (5) | $ (4) | $ (61)

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