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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 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Foreign currency forward contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision |  | $ 2,035 | $ 2,220 |
Cross Currency Swap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | 0 | 0 |
Fair Value, Asset |  | 0 | 0 |
Notional Value/Payment Provision |  | 45 | 95 |
Options/Futures contracts on notes and bonds |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision |  | 1,437 | 2,344 |
Convertibles and Bonds with Warrants Attached [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision |  | 4 | 7 | [1]
Investment And Embedded Derivative Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 15 | 33 |
Notional Value/Payment Provision |  | 3,521 | 4,666 |
Single-Stock Future [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision | [2] | 1,455 | 1,316 |
Other Derivatives [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision |  | 259 | 214 |
Other Derivative Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision |  | 1,714 | 1,530 |
Guaranteed Living Benefits [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional Value/Payment Provision | [3] | 1,138 | 1,264 |
Other Assets [Member] | Foreign currency forward contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 8 | 25 |
Other Assets [Member] | Options/Futures contracts on notes and bonds |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 7 | 6 |
Other Assets [Member] | Single-Stock Future [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset | [2] | 0 | 1 |
Other Assets [Member] | Other Derivatives [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 0 | 2 |
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 0 | 3 |
Other Assets [Member] | Guaranteed Living Benefits [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset | [3] | 0 | 0 |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | (31) | (50) |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | (6) | (4) |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Convertibles and Bonds with Warrants Attached [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | 0 | 0 | [1]
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Investment And Embedded Derivative Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | (37) | (54) |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Single-Stock Future [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability | [2] | (25) | 0 |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | (2) | (13) |
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability |  | (27) | (13) |
Fixed Maturities Available For Sale [Member] | Convertibles and Bonds with Warrants Attached [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Asset |  | 0 | 2 | [1]
Accounts Payable Future Policy Benefits [Member] | Guaranteed Living Benefits [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value, Liability | [3] | $ (635) | $ (853) |
[1] | Includes fair value of embedded derivatives.
[2] | Related to GMDB and GLB blocks of business.
[3] | Includes both future policy benefits reserves and fair value derivative adjustment. 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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