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Commitments, contingencies, and guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Future policy benefits |  | $ 5,947 | $ 5,713
Derivative, Notional Amount |  | 19,138 | 4,567
Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 6,182 | 2,807
Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 12,944 | 1,749
Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 12 | 11
Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 905 | 709
Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 3 | 16
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 908 | 725
Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | [1] | 1,432 | 1,658
Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (166) | (52)
Accounts Payable and Accrued Liabilities [Member] | Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (139) | (49)
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (27) | (3)
Accounts Payable and Accrued Liabilities [Member] | Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability | [2] | 0 | 0
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability | [3] | (16) | (17)
Accounts Payable and Accrued Liabilities [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | 0 | 0
Accounts Payable and Accrued Liabilities [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (16) | (17)
Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 69 | 44
Other Assets [Member] | Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 25 | 22
Other Assets [Member] | Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 33 | 13
Other Assets [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 0 | 0
Other Assets [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 0
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 0
Other Assets [Member] | Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 0
Accounts Payable Future Policy Benefits [Member] | Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (745) | (1,089)
Available-for-sale Securities [Member] | Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 11 | 9
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross |  | 745 | 1,089
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross |  | $ 745 | $ 1,089
[1] | Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts
[2] | Includes fair value of embedded derivatives.
[3] | Related to GMDB and GLB book of business.

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