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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivatives Fair Value [Line Items]    
Derivative assets $ 246 $ 179
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 214 157
Cash collateral (held) pledged, Assets (359) (266)
Derivative liabilities (731) (801)
Cash collateral (held) pledged, Liabilities 164 188
Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative assets 246 179
Impact of master netting agreements, Assets (32) (22)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 214 157
Cash collateral (held) pledged, Assets (359) (266)
Net position, Assets (145) (109)
Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liabilities (731) (801)
Impact of master netting agreements, Liabilities 32 22
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities (699) (779)
Cash collateral (held) pledged, Liabilities 164 188
Net position, Liabilities $ (535) $ (591)