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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 | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 34 |  | $ (228) | $ (585)
Foreign currency forward contracts [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (62) |  | 65 | (79)
Interest Rate Swap [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 0 |  | 0 | (270)
All Other Futures Contracts And Options [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (10) |  | 16 | (88)
Convertible Securities [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [1] | 0 | [2] | 0 | 2
Investment And Embedded Derivative Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (72) |  | 81 | (435)
GLB |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 316 |  | (202) | (4)
Futures contracts on equities |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [3] | (202) |  | (108) | (138)
Other Derivatives |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (8) |  | 1 | (8)
Guaranteed Living Benefit And Other Derivative Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 106 |  | $ (309) | $ (150)
[1] | Includes embedded derivatives.
[2] | Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability
[3] | Related to GMDB and GLB book 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=125515794&loc=SL5618551-113959 + Details
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