Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 140 $ 201 $ 368
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 16 26 39
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 51 88 158
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 19 30 64
Trial modifications      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 54 $ 57 $ 107