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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |  |
Future policy benefits |  | $ 13,888 | $ 10,476 | $ 7,837 | $ 7,652
Foreign currency forward contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 3,662 | 4,134 |  |
Futures contracts on notes and bonds [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 2,062 | 1,511 |  |
Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount | [1] | 64 | 37 |  |
Investment And Embedded Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 5,788 | 5,682 |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 110 | 112 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (136) | (139) |  |
Futures contracts on equities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount | [2] | 1,157 | 939 |  |
Other |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 217 | 0 |  |
Other Derivative Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,374 | 939 |  |
Fair Value Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,631 | 1,595 |  |
Net Investment Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 1,619 | 1,604 |  |
Designated as Hedging Instrument |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 3,250 | 3,199 |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 136 | 17 |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (128) | 53 |  |
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 |  | (94) | (115) |  |
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 |  | (42) | (24) |  |
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] | (37) | 0 |  |
Accounts Payable and Accrued Liabilities [Member] | Other |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset |  | (5) | 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 |  | (42) | 0 |  |
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 |  | (128) | (53) |  |
Other Assets [Member] | Foreign currency forward contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 27 | 64 |  |
Other Assets [Member] | Futures contracts on notes and bonds [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 27 | 18 |  |
Other Assets [Member] | Futures contracts on equities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | [2] | 0 | 33 |  |
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 |  | 0 | 33 |  |
Other Assets [Member] | Fair Value Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 126 | 17 |  |
Other Assets [Member] | Net Investment Hedging |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset |  | 10 | 0 |  |
Fixed Maturities [Member] | Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | [1] | 56 | 30 |  |
Equity Securities [Member] | Convertible Securities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | [1] | $ 0 | $ 0 |  |
[1] | Includes fair value of embedded derivatives.
[2] | Related to MRB book of business.

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