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Derivative Financial Instruments - Collateral Held and Pledged (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Collateral held:    
Cash (obligation to return cash collateral is recorded in short-term borrowings) $ 425 $ 759
Securities at fair value - corporate derivatives (not recorded in the financial statements) 376  
Securities at fair value - on-balance sheet securitization derivatives (not recorded in financial statements) 394 301
Total collateral held 1,195 1,060
Derivative asset at fair value including accrued interest 1,062 896
Collateral pledged to others:    
Cash (right to receive return of cash collateral is recorded in investments) 407 466
Total collateral pledged 407 466
Derivative liability at fair value including accrued interest and premium receivable $ 1,343 $ 1,395