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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 42 $ 23 $ 64 $ 68
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 1 2 2 8
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 33 5 45 19
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 2 4 5 11
Trial modifications        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 6 $ 12 $ 12 $ 30