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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 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 $ 499   $ 499   $ 495
Other guarantees carrying value 233   233   $ 245
Mortgage loans held for sale measured at fair value, net gain (loss) $ (144) $ (18) $ (442) $ (135)  
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     234.00%    
Weighted Average [Member]          
Fair Value Disclosures [Abstract]          
Assumed credit valuation adjustment as percentage of derivative contract fair value     1.00%