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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Gross position, Assets $ 471 $ 565
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 423 534
Cash collateral (held) pledged, Assets (317) (345)
Gross position, Liabilities (1,540) (1,701)
Cash collateral (held) pledged, Liabilities 282 319
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Gross position, Liabilities (1,540) (1,701)
Impact of master netting agreements, Liabilities 48 31
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities (1,492) (1,670)
Cash collateral (held) pledged, Liabilities 282 319
Net position, Liabilities (1,210) (1,351)
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross position, Assets 471 565
Impact of master netting agreements, Assets (48) (31)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 423 534
Cash collateral (held) pledged, Assets (317) (345)
Net position, Assets $ 106 $ 189