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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Derivative assets $ 276 $ 357
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 246 307
Cash collateral (held) pledged, Assets (285) (336)
Derivative liabilities (269) (533)
Cash collateral (held) pledged, Liabilities 183 234
Other Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative assets 276 357
Impact of master netting agreements, Assets (30) (50)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets 246 307
Cash collateral (held) pledged, Assets (285) (336)
Net position, Assets (39) (29)
Other Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liabilities (269) (533)
Impact of master netting agreements, Liabilities 30 50
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities (239) (483)
Cash collateral (held) pledged, Liabilities 183 234
Net position, Liabilities $ (56) $ (249)