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Loans - Consumer, Excluding Credit Card Loan Portfolio, Loan Modifications, Nature and Extent of Modifications (Details) - Consumer, excluding credit card - loan
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Impaired [Line Items]        
Percentage, sum of items by type, may exceed     100.00%  
Total residential real estate – excluding PCI | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,219 1,099 3,389 3,684
Total residential real estate – excluding PCI | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 1,162 1,658 3,956 6,379
Total residential real estate – excluding PCI | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 89.00% 69.00% 78.00% 49.00%
Total residential real estate – excluding PCI | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 68.00% 86.00% 72.00% 57.00%
Total residential real estate – excluding PCI | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 10.00% 19.00% 13.00% 31.00%
Total residential real estate – excluding PCI | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 5.00% 8.00% 5.00% 7.00%
Total residential real estate – excluding PCI | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 76.00% 49.00% 63.00% 52.00%
Residential mortgage | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 365 513 1,603 1,789
Residential mortgage | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 307 719 1,178 2,374
Residential mortgage | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 78.00% 58.00% 65.00% 36.00%
Residential mortgage | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 94.00% 83.00% 91.00% 49.00%
Residential mortgage | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 21.00% 30.00% 26.00% 47.00%
Residential mortgage | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 7.00% 9.00% 6.00% 7.00%
Residential mortgage | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 53.00% 36.00% 44.00% 40.00%
Home equity | Trial Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 854 586 1,786 1,895
Home equity | Permanent Modification        
Financing Receivable, Impaired [Line Items]        
Number of loans modified 855 939 2,778 4,005
Home equity | Interest rate reduction        
Financing Receivable, Impaired [Line Items]        
Concession granted 93.00% 77.00% 83.00% 57.00%
Home equity | Term or payment extension        
Financing Receivable, Impaired [Line Items]        
Concession granted 59.00% 88.00% 64.00% 62.00%
Home equity | Principal and/or interest deferred        
Financing Receivable, Impaired [Line Items]        
Concession granted 6.00% 11.00% 7.00% 22.00%
Home equity | Principal forgiveness        
Financing Receivable, Impaired [Line Items]        
Concession granted 4.00% 7.00% 5.00% 7.00%
Home equity | Other        
Financing Receivable, Impaired [Line Items]        
Concession granted 85.00% 58.00% 71.00% 58.00%