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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Losses related to discontinued cash flow hedge relationships amortized to earnings $ (1) $ (8) $ (11) $ (27)  
Next twelve months, reclassification of remaining losses to earnings resulting from cash flow hedges     11    
Aggregate fair value of all derivative instruments with credit-risk related contingent features 645   645   $ 611
Collateral already posted aggregate fair value $ 537   $ 537   $ 316