Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - TDRs Entering Payment Default That Were Modified During the Preceding 12 Months (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - TDRs Entering Payment Default That Were Modified During the Preceding 12 Months (Details) - Consumer real estate - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 33 $ 47 $ 101 $ 154
Modifications under government programs        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 6 7 14 20
Modifications under proprietary programs        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 8 19 27 68
Loans discharged in Chapter 7 bankruptcy        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 4 8 15 26
Trial modifications        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 15 $ 13 $ 45 $ 40