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Loans - Consumer, Excluding Credit Card Loan Portfolio, Loan Modifications, Nature and Extent of Modifications (Details) - Consumer, excluding credit card - Residential real estate
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Financing Receivable, Impaired [Line Items]        
New TDRs | $ $ 116 $ 199 $ 674 $ 537
Percentage, sum of items by type, may exceed     100.00%  
Trial modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,448 1,623 4,014 4,468
Permanent modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 917 1,615 3,817 5,200
Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 75.00% 40.00% 74.00% 51.00%
Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 64.00% 39.00% 49.00% 53.00%
Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 19.00% 21.00% 24.00% 12.00%
Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 1.00% 1.00% 2.00% 2.00%
Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 24.00% 65.00% 39.00% 65.00%