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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | $ 2,752 | $ 2,185
Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 0 | 45
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 2,000 | 5,250
Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 829 | 1,046
Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [1] | 9 | 11
To be announced [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 0 | 6
Total investment and embedded derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 5,590 | 8,543
Fair Value, Asset |  | 21 | 43
Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [2] | 560 | 507
Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 207 | 74
Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision |  | 767 | 581
Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Value/Payment Provision | [3] | 1,537 | 1,750
Fair Value, Asset | [3] | 0 | 0
Other Assets [Member] | Foreign currency forward contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 12 | 15
Other Assets [Member] | Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 0 | 0
Other Assets [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 0 | 0
Other Assets [Member] | Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 3 | 13
Other Assets [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset | [2] | 0 | 23
Other Assets [Member] | Other |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 15 | 2
Other Assets [Member] | Other Derivative Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset |  | 15 | 25
Fixed Maturities [Member] | Convertible securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Asset | [1] | 6 | 9
Fixed Maturities [Member] | To be announced [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Fair Value, Asset |  | 0 | 6
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 |  | (49) | (19)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Cross-currency swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | 0 | 0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (104) | (115)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes, bonds, and equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (11) | (19)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Total investment and embedded derivative instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability |  | (164) | (153)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [2] | (10) | 0
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 |  | (10) | 0
Balance Sheet Location Accounts Payable Future Policy Benefits [Member] | Guaranteed Minimum Income Benefit [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value, Liability | [3] | $ (815) | $ (861)
[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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