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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, 2021 | Dec. 31, 2020
--- | --- | ---
Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | $ 3,657 | $ 2,807
Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 2,063 | 1,749
Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | [1] | 13 | 11
Total investment and embedded derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 80 | 44
Fair Value, Liability |  | (79) | (52)
Derivative, Notional Amount |  | 5,733 | 4,567
Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | [2] | 761 | 709
Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 52 | 16
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount |  | 813 | 725
Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 0 | 0
Derivative, Notional Amount | [3] | 1,506 | 1,658
Other Assets [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 21 | 22
Other Assets [Member] | Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 48 | 13
Other Assets [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [2] | 0 | 0
Other Assets [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 2 | 0
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 2 | 0
Fixed Maturities [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [1] | 11 | 9
Equity Securities [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [1] | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (69) | (49)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (10) | (3)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [2] | (7) | (17)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (7) | (17)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [3] | $ (760) | $ (1,089)
[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.

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