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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 23 $ 46 $ 68 $ 107
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 2 6 8 13
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 5 20 19 49
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 9 11 18
Trial modifications        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 12 $ 11 $ 30 $ 27