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
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 22 $ 45
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 6
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 12 14
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 3 7
Trial modifications    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 6 $ 18