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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value Disclosures [Abstract]          
Mortgage loans held for sale measured at fair value, net gain (loss) $ 98 $ 81 $ (117) $ 174  
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit 656   656   $ 774
Other guarantees carrying value $ 315   $ 315   $ 362
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     94.00%    
Weighted-average [Member]          
Fair Value Disclosures [Abstract]          
Assumed credit valuation adjustment as percentage of derivative contract fair value     1.00%