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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases $ 1,045,747 $ 979,124  
Gross charge-offs 3,439 3,797 $ 5,419
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross charge-offs 206 78 $ 98
Consumer real estate | Home Equity Loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 26,563 27,935  
Gross charge-offs 45    
Consumer real estate | Home Equity Loan | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 683 893  
Consumer real estate | Home Equity Loan | Greater than or equal to 620 and less than 680      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 1,190 1,434  
Consumer real estate | Home Equity Loan | Greater than or equal to 680 and less than 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 4,321 4,625  
Consumer real estate | Home Equity Loan | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 20,369 20,983  
Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 1,361 1,913  
Gross charge-offs 5    
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 166 244  
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 152 222  
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 312 468  
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 731 979  
Consumer real estate | Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 937 1,300  
Consumer real estate | Home Equity Loan no Longer Originated      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 424 582  
Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 20,019 19,183  
Gross charge-offs, Revolving Loans 24    
Consumer real estate | Revolving Loans | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 189 209  
Consumer real estate | Revolving Loans | Greater than or equal to 620 and less than 680      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 507 495  
Consumer real estate | Revolving Loans | Greater than or equal to 680 and less than 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 2,747 2,493  
Consumer real estate | Revolving Loans | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 16,576 15,986  
Consumer real estate | Revolving Loans Converted to Term Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans Converted to Term Loans 5,183 6,839  
Gross charge-offs, Revolving Loans Converted to Term Loans 16    
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 328 440  
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 531 717  
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 1,262 1,664  
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 3,062 4,018  
Less than or equal to 90 percent | Consumer real estate | Home Equity Loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 26,395 27,594  
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 1,304 1,773  
Less than or equal to 90 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 19,960 19,095  
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 5,131 6,726  
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Home Equity Loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 62 130  
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 20 55  
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 24 34  
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 18 41  
Greater than 100 percent | Consumer real estate | Home Equity Loan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 106 211  
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 37 85  
Greater than 100 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 35 54  
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 $ 34 $ 72