Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - Modification Programs (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - Modification Programs (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]      
Total modifications $ 715 $ 478 $ 999
Modifications under government programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 13 35 61
Modifications under proprietary programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 570 174 523
Loans discharged in Chapter 7 bankruptcy      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 53 68 130
Trial modifications      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications $ 79 $ 201 $ 285