Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Home Equity - Credit Quality Indicators Including Vintage (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Home Equity - Credit Quality Indicators Including Vintage (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 927,861 $ 983,426
Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 34,311  
Consumer real estate | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,082  
Consumer real estate | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,798  
Consumer real estate | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 5,762  
Consumer real estate | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 25,669  
Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,217  
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 250  
Consumer real estate | Home Equity Loans and Reverse Mortgages | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 263  
Consumer real estate | Home Equity Loans and Reverse Mortgages | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 556  
Consumer real estate | Home Equity Loans and Reverse Mortgages | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,148  
Consumer real estate | Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,300  
Consumer real estate | Home Equity Loan no Longer Originated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 885  
Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 22,851  
Consumer real estate | Revolving Loans | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 244  
Consumer real estate | Revolving Loans | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 568  
Consumer real estate | Revolving Loans | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 2,905  
Consumer real estate | Revolving Loans | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 19,134  
Consumer real estate | Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 9,243  
Consumer real estate | Revolving Loans Converted to Term Loans | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 588  
Consumer real estate | Revolving Loans Converted to Term Loans | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 967  
Consumer real estate | Revolving Loans Converted to Term Loans | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 2,301  
Consumer real estate | Revolving Loans Converted to Term Loans | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 5,387  
Less than or equal to 90 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 33,447  
Less than or equal to 90 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,919  
Less than or equal to 90 percent | Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 22,639  
Less than or equal to 90 percent | Consumer real estate | Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 8,889  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 351  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 126  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 94  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 131  
Greater than 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 513  
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 172  
Greater than 100 percent | Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 118  
Greater than 100 percent | Consumer real estate | Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans $ 223