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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Gross position, Assets $ 1,109 $ 728
Cash collateral (held) pledged, Assets (451) (759)
Gross position, Liabilities (1,611) (1,515)
Cash collateral (held) pledged, Liabilities 511 466
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross position, Liabilities (1,611) (1,515)
Impact of master netting agreements, Liabilities 26 50
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities (1,585) (1,465)
Cash collateral (held) pledged, Liabilities 511 466
Net position, Liabilities (1,074) (999)
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross position, Assets 1,109 728
Impact of master netting agreements, Assets (26) (50)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 1,083 678
Cash collateral (held) pledged, Assets (451) (759)
Net position, Assets $ 632 $ (81)