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Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | $ (223) |  | $ (17) | $ (562) |  | $ 91
Foreign currency forward contracts |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (20) |  | (2) | (57) |  | 5
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (55) |  | 26 | (270) |  | 26
All Other Futures Contracts, Options and equities [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (22) |  | 13 | (83) |  | 47
Convertible securities |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | 0 | [1] | 0 | 2 | [1] | 0
Total investment and embedded derivative instruments |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (97) |  | 37 | (408) |  | 78
GLB |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative | [2] | (106) |  | 54 | (57) |  | 133
Futures contracts on equities |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative | [3] | (6) |  | (100) | (89) |  | (122)
Other |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (14) |  | (8) | (8) |  | 2
Guaranteed Living Benefit And Other Derivative Instruments [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | $ (126) |  | $ (54) | $ (154) |  | $ 13
[1] | Includes embedded derivatives.
[2] | Excludes foreign exchange gains (losses) related to GLB.
[3] | Related to GMDB and GLB books of business.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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