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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, 2021
USD ($)
loan_payment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]      
Carrying value $ 948,642 $ 1,003,089 $ 960,506
Consumer, excluding credit card      
Financing Receivable, Impaired [Line Items]      
Carrying value $ 302,392 $ 293,779 302,127
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 $ 219,173   225,302
Consumer, excluding credit card | Residential real estate | In Process of Active or Suspended Foreclosure      
Financing Receivable, Impaired [Line Items]      
Carrying value $ 802   $ 846
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 4.57% 5.20%  
Weighted-average interest rate of loans with interest rate reductions – after TDR 2.91% 3.48%  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – before TDR 24 years 22 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 12 5  
Principal forgiven 1 2  
Balance of loans that redefaulted within one year of permanent modification $ 24 $ 70  
Modifications, weighted-average remaining life 6 years