Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Troubled Debt Restructurings, Narrative (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Troubled Debt Restructurings, Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
payment
Dec. 31, 2019
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 955,172 $ 983,426
Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 36,530  
Real estate acquired through foreclosure 135 $ 229
Loans with formal foreclosure proceeding in process 1,300  
Reclassified consumer real estate loans $ 169  
Number of missing payments causing default | payment 3  
Consumer real estate | Chapter Seven Bankruptcy    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 385  
Nonperforming Loans | Consumer real estate | Chapter Seven Bankruptcy | US Government Sponsored-Enterprise Insured Loans | Federal Housing Administration    
Financing Receivable, Credit Quality Indicator [Line Items]    
Real estate acquired through foreclosure 101  
Performing Financial Instruments | Consumer real estate | Chapter Seven Bankruptcy | US Government Sponsored-Enterprise Insured Loans | Federal Housing Administration    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 71