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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 6 Months Ended
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Financing Receivable, Impaired [Line Items]        
New TDRs | $ $ 307 $ 196 $ 558 $ 338
Percentage, sum of items by type, may exceed     100.00%  
Trial modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,165 849 2,566 2,845
Permanent modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,186 2,104 2,900 3,585
Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 78.00% 41.00% 74.00% 56.00%
Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 51.00% 45.00% 45.00% 60.00%
Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 18.00% 6.00% 26.00% 8.00%
Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 0.00% 2.00% 2.00% 3.00%
Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 34.00% 72.00% 44.00% 65.00%