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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, 2020 | Mar. 31, 2019
Gain (Loss) on Securities [Line Items] |  |  |
OTTI on fixed maturities, gross |  | $ 0 | $ (13)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) |  | 149 |
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell | [1] | (121) | 0
Foreign exchange gains |  | (68) | 13
Gain (Loss) on Derivative |  | (547) | (80)
Net Realized Gains (Losses) |  | (958) | (97)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 0 | 0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings |  | 0 | (13)
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (685) | 114
Investment and embedded derivative instruments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Gain (Loss) on Derivative |  | 15 | (130)
S&P put options and futures |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Gain (Loss) on Derivative |  | 125 | (63)
Other derivative instruments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Gain (Loss) on Derivative |  | (2) | (1)
Fixed Maturities [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Debt Securities, Available-for-sale, Realized Gain, Excluding Other-than-temporary Impairment |  | 77 | 27
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment |  | (125) | (58)
Debt Securities, Available-for-sale, Realized Gain (Loss) |  | (319) | (44)
Debt Securities [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings |  | 0 | (13)
Equity Securities [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Equity Securities, FV-NI, Realized Gain (Loss) |  | (29) | 58
Other Investments [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Other investments gain (loss) |  | 5 | (44)
Accounting Standards Update 2016-13 [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) |  | $ (150) | $ 0
[1] | Related to our intent to sell certain securities.

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