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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment (OTTI) losses gross |  |  |  |  |  |  |  | $ (52) | $ (46) | $ (111)
OTTI on fixed maturities, net |  |  |  |  |  |  |  |  | (45) | (103)
OTTI on Fixed Maturities |  |  |  |  |  |  |  | 49 |  |
Foreign exchange gains( losses) |  |  |  |  |  |  |  | 131 | 36 | 118
Fair Value adjustment on insurance derivative |  |  |  |  |  |  |  | (248) | 364 | 53
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  | (330) | 87 | (126)
Net Realized Gain (Loss) | $ (687) | $ 19 | $ 18 | $ (2) |  |  |  | (652) |  |
Net Realized Investment Gains (Losses) including OTTI |  |  |  |  | $ (10) | $ 101 | $ (7) |  | 84 | (145)
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  | (1,699) | 392 | 184
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax |  |  |  |  |  |  |  | 297 | (241) | 100
Other derivative instruments |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  | (3) | (5) | (10)
Investment and embedded derivative instruments |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  | (75) | (11) | (33)
S&P Options and Futures |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  |  |  |  |  |  | (4) | (261) | (136)
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment (OTTI) losses gross |  |  |  |  |  |  |  | 0 | (10) | (8)
Equity Securities, FV-NI, Realized Gain |  |  |  |  |  |  |  | 74 |  |
Equity Securities - Gross Realized Gains Excluding OTTI |  |  |  |  |  |  |  |  | 28 | 65
Equity Securities, FV-NI, Realized Loss |  |  |  |  |  |  |  | 133 |  |
Equity Securities - Gross realized losses excluding OTTI |  |  |  |  |  |  |  |  | (2) | (13)
Equity Securities, FV-NI, Realized Gain (Loss) |  |  |  |  |  |  |  | (59) |  |
Total net realized gains (losses) (includes $(302), $(15), and $(119) reclassified from AOCI) |  |  |  |  |  |  |  |  | 16 | 44
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  | 0 | 88 | 52
Fixed maturities held to maturity |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  | (38) | 18 | (59)
Other Investments [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment (OTTI) losses gross |  |  |  |  |  |  |  | 0 | (12) | (14)
Realized Investment Gains (Losses) |  |  |  |  |  |  |  | (5) | 0 | 0
Available-for-sale Securities [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  | (1,958) | 519 | 142
Debt Securities [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment (OTTI) losses gross |  |  |  |  |  |  |  | (52) | (24) | (89)
OTTI on fixed maturities recognized in OCI (pre-tax) |  |  |  |  |  |  |  | 3 | 1 | 8
OTTI on fixed maturities, net |  |  |  |  |  |  |  |  | (23) | (81)
Gross realized gains excluding OTTI |  |  |  |  |  |  |  |  | 149 | 183
Gross realized losses excluding OTTI |  |  |  |  |  |  |  |  | 157 | 265
OTTI on Fixed Maturities |  |  |  |  |  |  |  | 49 |  |
Total fixed maturities |  |  |  |  |  |  |  |  | (31) | (163)
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment |  |  |  |  |  |  |  | 334 |  |
Debt Securities, Available-for-sale, Realized Loss, Excluding Other-than-temporary Impairment |  |  |  |  |  |  |  | (587) |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) |  |  |  |  |  |  |  | (302) |  |
Other [Member] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Other Investments |  |  |  |  |  |  |  | (87) | (12) | (4)
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  | $ 0 | $ 8 | $ (51)

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