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Loans - Consumer, Excluding Credit Card Loan Portfolio, Financial Effects of Modifications and Redefaults (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Carrying value $ 1,018,397 $ 1,084,850 $ 1,089,598
Consumer, excluding credit card      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Carrying value $ 296,161 300,447 300,753
Consumer, excluding credit card | Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Carrying value   236,115 237,561
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Carrying value   $ 580 $ 565
Consumer, excluding credit card | Residential real estate | Maximum      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of years before payment default under a modified loan 1 year    
Consumer, excluding credit card | Residential real estate | Permanent modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Weighted-average interest rate of loans with interest rate reductions – before TDR 4.43%    
Weighted-average interest rate of loans with interest rate reductions – after TDR 3.31%    
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – before TDR 23 years    
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – after TDR 39 years    
Charge-offs recognized upon permanent modification $ 0    
Principal deferred 7    
Principal forgiven 1    
Amortized cost basis $ 43