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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | $ 3,647 | $ 3,662
Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 1,746 | 2,062
Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | [1] | 69 | 64
Investment And Embedded Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 92 | 110
Fair Value, Liability |  | (144) | (136)
Derivative, Notional Amount |  | 5,462 | 5,788
Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | [2] | 1,162 | 1,157
Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 149 | 136
Fair Value, Liability |  | (110) | 128
Derivative, Notional Amount |  | 3,267 | 3,250
Fair Value Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 1,642 | 1,631
Net Investment Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 1,625 | 1,619
Other derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 269 | 217
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 1,431 | 1,374
Other Assets [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 23 | 27
Other Assets [Member] | Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 5 | 27
Other Assets [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [2] | 0 | 0
Other Assets [Member] | Fair Value Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 133 | 126
Other Assets [Member] | Net Investment Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 16 | 10
Other Assets [Member] | Other derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 1 | 0
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 1 | 0
Fixed Maturities [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Not Subject to Master Netting Arrangement | [1] | 64 | 56
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (135) | (94)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (9) | (42)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [2] | (22) | (37)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Fair Value Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Net Investment Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (110) | (128)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (6) | (5)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (28) | (42)
Equity Securities | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability, Not Subject to Master Netting Arrangement | [1] | $ 0 | $ 0
[1] | Includes fair value of embedded derivatives.
[2] | Related to MRB book of business.

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