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Derivative Financial Instruments - Collateral Held and Pledged (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Collateral held:    
Cash (obligation to return cash collateral is recorded in short-term borrowings) $ 451 $ 759
Securities at fair value - corporate derivatives (not recorded in the financial statements) 503  
Securities at fair value - on-balance sheet securitization derivatives (not recorded in financial statements) 391 301
Total collateral held 1,345 1,060
Derivative asset at fair value including accrued interest 1,272 896
Collateral pledged to others:    
Cash (right to receive return of cash collateral is recorded in investments) 511 466
Total collateral pledged 511 466
Derivative liability at fair value including accrued interest and premium receivable $ 1,610 $ 1,395