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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value Disclosures [Abstract]          
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit $ 486   $ 486   $ 495
Other guarantees carrying value 224   224   $ 245
Mortgage loans held for sale measured at fair value, net gain (loss) $ (64) $ (98) $ 298 $ 117  
Minimum [Member]          
Fair Value Disclosures [Abstract]          
Assumed credit valuation adjustment as percentage of derivative contract fair value     0.00%    
Maximum [Member]          
Fair Value Disclosures [Abstract]          
Assumed credit valuation adjustment as percentage of derivative contract fair value     158.00%    
Weighted Average [Member]          
Fair Value Disclosures [Abstract]          
Assumed credit valuation adjustment as percentage of derivative contract fair value     2.00%