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Loans - Consumer, Excluding Credit Card Loan Portfolio, Financial Effects of Modifications and Redefaults (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
loan_payment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]          
Carrying value $ 963,665 $ 965,448 $ 963,665 $ 965,448 $ 960,506
Consumer, excluding credit card          
Financing Receivable, Impaired [Line Items]          
Carrying value 297,731 $ 307,005 $ 297,731 $ 307,005 302,127
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 218,031   $ 218,031   225,302
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure          
Financing Receivable, Impaired [Line Items]          
Carrying value $ 743   $ 743   $ 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 4.39% 5.00% 4.51% 5.13%  
Weighted-average interest rate of loans with interest rate reductions – after TDR 2.85% 3.36% 2.90% 3.42%  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – before TDR 22 years 21 years 24 years 21 years  
Weighted-average remaining contractual term (in years) of loans with term or payment extensions – after TDR 36 years 39 years 38 years 39 years  
Charge-offs recognized upon permanent modification $ 0 $ 2 $ 0 $ 2  
Principal deferred 6 4 18 9  
Principal forgiven 0 1 1 3  
Balance of loans that redefaulted within one year of permanent modification $ 21 $ 38 $ 45 $ 108  
Modifications, weighted-average remaining life     5 years