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Loans - Consumer, Excluding Credit Card Loan Portfolio, Financial Effects of Modifications and Redefaults (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
loan_payment
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Impaired [Line Items]      
Carrying value $ 1,018,397 $ 948,642 $ 1,010,206
Consumer, excluding credit card      
Financing Receivable, Impaired [Line Items]      
Carrying value $ 296,161 $ 302,392 295,556
Consumer, excluding credit card | Residential real estate      
Financing Receivable, Impaired [Line Items]      
Number of payments past due for deemed payment | loan_payment 2    
Carrying value $ 227,926   224,795
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure      
Financing Receivable, Impaired [Line Items]      
Carrying value $ 767   $ 619
Consumer, excluding credit card | Residential real estate | Maximum      
Financing Receivable, Impaired [Line Items]      
Number of years before payment default under a modified loan 1 year    
Number of months before a payment redefault under modified loans 12 months    
Consumer, excluding credit card | Residential real estate | Permanent modification      
Financing Receivable, Impaired [Line Items]      
Weighted-average interest rate of loans with interest rate reductions – before TDR 4.43% 4.57%  
Weighted-average interest rate of loans with interest rate reductions – after TDR 3.31% 2.91%  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – before TDR 23 years 24 years  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – after TDR 39 years 39 years  
Charge-offs recognized upon permanent modification $ 0 $ 0  
Principal deferred 7 12  
Principal forgiven 1 1  
Balance of loans that redefaulted within one year of permanent modification $ 43 $ 24  
Modifications, weighted-average remaining life 5 years