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Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($)
$ in Millions
Oct. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
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