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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Losses related to discontinued cash flow hedge relationships amortized to earnings $ (1) $ (6)  
Next twelve months, reclassification of remaining losses to earnings resulting from cash flow hedges 4    
Aggregate fair value of all derivative instruments with credit-risk related contingent features 198   $ 221
Collateral already posted aggregate fair value $ 113   $ 67