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Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions | Oct. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  | $ 932 |
Derivative liability subject to a master netting agreement |  | 41 | $ 10
Unrecognized tax benefits |  | 14 |
Repurchase agreements |  | 1,408 | $ 1,403
Funding commitments relating to limited partnerships and partially-owned investment companies |  | 1,700 |
Carrying value of limited partnerships and partially-owned investment companies included in other investments |  | $ 3,400 |
Subsequent Event [Member] |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Funding commitments relating to limited partnerships and partially-owned investment companies | $ 2,500 |  |

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