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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | $ (259) |  | $ 29 | $ (339) |  | $ 108
Foreign currency forward contracts |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (22) |  | 3 | (37) |  | 7
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (135) |  | 0 | (215) |  | 0
All Other Futures Contracts, Options and equities [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (25) |  | 21 | (61) |  | 34
Convertible securities |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | 1 | [1] | 0 | 2 | [1] | 0
Total investment and embedded derivative instruments |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | (181) |  | 24 | (311) |  | 41
GLB |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative | [2] | (65) |  | 41 | 49 |  | 79
Futures contracts on equities |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative | [3] | (20) |  | (44) | (83) |  | (22)
Other |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | 7 |  | 8 | 6 |  | 10
Guaranteed Living Benefit And Other Derivative Instruments [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Derivative |  | $ (78) |  | $ 5 | $ (28) |  | $ 67
[1] | Includes embedded derivatives.
[2] | Excludes foreign exchange gains (losses) related to GLB.
[3] | Related to GMDB and GLB blocks 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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