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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, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | $ 8,543 | $ 3,122
Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 2,185 | 2,064
Cross Currency Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 45 | 45
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 5,250 | 0
Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 1,046 | 1,007
Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [1] | 11 | 6
To be announced [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 6 | 0
Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [2] | 507 | 1,553
Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 74 | 75
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 581 | 1,628
Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [3] | 1,750 | 1,083
Accounts Payable and Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (153) | (30)
Accounts Payable and Accrued Liabilities [Member] | Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (19) | (27)
Accounts Payable and Accrued Liabilities [Member] | Cross Currency Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | 0 | 0
Accounts Payable and Accrued Liabilities [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (115) | 0
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | (19) | (3)
Accounts Payable and Accrued Liabilities [Member] | Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability | [1] | 0 | 0
Accounts Payable and Accrued Liabilities [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability | [2] | 0 | (21)
Accounts Payable and Accrued Liabilities [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | 0 | (2)
Accounts Payable and Accrued Liabilities [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability |  | 0 | (23)
Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 43 | 23
Other Assets [Member] | Foreign currency forward contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 15 | 14
Other Assets [Member] | Cross Currency Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 0
Other Assets [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 0
Other Assets [Member] | Futures contracts on notes and bonds [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 13 | 4
Other Assets [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [2] | 23 | 0
Other Assets [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 2 | 1
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 25 | 1
Other Assets [Member] | Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [3] | 0 | 0
Accounts Payable Future Policy Benefits [Member] | Guaranteed Minimum Income Benefit |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability | [3] | (861) | (550)
Available-for-sale Securities [Member] | Convertible Securities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | [1] | 9 | 5
Available-for-sale Securities [Member] | To be announced [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 6 | 0
Derivative Liability |  | $ 0 | $ 0
[1] | Includes fair value of embedded derivatives.
[2] | Related to GMDB and GLB blocks of business.
[3] | (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 4 c) for additional information. 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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