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Loans - Consumer, Excluding Credit Card Loan Portfolio, Financial Effects of Modifications and Redefaults (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan_payment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]          
Carrying value $ 974,260 $ 945,537 $ 974,260 $ 945,537 $ 960,506
Consumer, excluding credit card          
Financing Receivable, Impaired [Line Items]          
Carrying value 298,308 $ 305,106 $ 298,308 $ 305,106 302,127
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 221,671   $ 221,671   225,302
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure          
Financing Receivable, Impaired [Line Items]          
Carrying value $ 693   $ 693   $ 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 4.65% 4.99% 4.55% 5.10%  
Weighted-average interest rate of loans with interest rate reductions – after TDR 2.89% 3.34% 2.91% 3.40%  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – before TDR 23 years 23 years 23 years 22 years  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – after TDR 37 years 39 years 37 years 39 years  
Charge-offs recognized upon permanent modification $ 0 $ 1 $ 0 $ 2  
Principal deferred 5 3 23 12  
Principal forgiven 0 1 1 4  
Balance of loans that redefaulted within one year of permanent modification $ 52 $ 65 $ 97 $ 173  
Modifications, weighted-average remaining life     4 years