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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, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |  |
Future policy benefits |  | $ 10,120 |  | $ 5,947 |
Foreign currency forward contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 4,134 |  | 6,182 |
Futures contracts on notes and bonds [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,511 |  | 12,944 |
Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount | [1] | 37 |  | 12 |
Investment And Embedded Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 5,682 |  | 19,138 |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 112 |  | 69 |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (139) |  | (166) |
Futures contracts on equities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount | [2] | 939 |  | 905 |
Other |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 0 |  | 3 |
Other Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 939 |  | 908 |
Guaranteed Minimum Income Benefit |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount | [3] | 1,979 |  | 1,432 |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | [3] | 0 |  | 0 |
Fair Value Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,595 |  | 0 |
Net Investment Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,604 |  | 0 |
Designated as Hedging Instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 3,199 |  | 0 |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 17 |  | 0 |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (53) |  | 0 |
Accounts Payable and Accrued Liabilities [Member] | Foreign currency forward contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (115) |  | (139) |
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on notes and bonds [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (24) |  | (27) |
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on equities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | [2] | 0 |  | (16) |
Accounts Payable and Accrued Liabilities [Member] | Other |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | 0 |  | 0 |
Accounts Payable and Accrued Liabilities [Member] | Other Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | 0 |  | (16) |
Accounts Payable and Accrued Liabilities [Member] | Guaranteed Minimum Income Benefit |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | [3] | (736) |  | (745) |
Accounts Payable and Accrued Liabilities [Member] | Fair Value Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | 0 |  | 0 |
Accounts Payable and Accrued Liabilities [Member] | Net Investment Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (53) |  | 0 |
Other Assets [Member] | Foreign currency forward contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 64 |  | 25 |
Other Assets [Member] | Futures contracts on notes and bonds [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 18 |  | 33 |
Other Assets [Member] | Futures contracts on equities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | [2] | 33 |  | 0 |
Other Assets [Member] | Other |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 0 |  | 0 |
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 33 |  | 0 |
Other Assets [Member] | Fair Value Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 17 |  | 0 |
Other Assets [Member] | Net Investment Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 0 |  | 0 |
Fixed Maturities [Member] | Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | [1] | 30 |  | 11 |
Equity Securities [Member] | Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | [1] | 0 |  | 0 |
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 3 |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross |  | $ 736 | [4],[5] | $ 745 | [6]
[1] | Includes fair value of embedded derivatives.
[2] | Related to GMDB and GLB book of business.
[3] | 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
[4] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[5] | The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.
[6] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

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