Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total modifications $ 513 $ 123
Modifications under government programs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total modifications 1 1
Modifications under proprietary programs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total modifications 472 28
Loans discharged in Chapter 7 bankruptcy    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total modifications 11 15
Trial modifications    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total modifications $ 29 $ 79