Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases $ 1,051,224   $ 1,051,224   $ 1,045,747
Total gross charge-offs 1,125 $ 944 2,180 $ 1,678  
Consumer real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total gross charge-offs 15 $ 160 29 $ 183  
Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,536   25,536   26,563
Total gross charge-offs     11   45
Consumer real estate | Home equity | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 635   635   683
Consumer real estate | Home equity | Greater than or equal to 620 and less than 680          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 1,105   1,105   1,190
Consumer real estate | Home equity | Greater than or equal to 680 and less than 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 4,182   4,182   4,321
Consumer real estate | Home equity | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 19,614   19,614   20,369
Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 1,217   1,217   1,361
Total gross charge-offs     1   5
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 138   138   166
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 133   133   152
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 273   273   312
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 673   673   731
Consumer real estate | Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 834   834   937
Consumer real estate | Home Equity Loan no Longer Originated          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 383   383   424
Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 19,739   19,739   20,019
Gross charge-offs, Revolving Loans     5   24
Consumer real estate | Revolving Loans | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 204   204   189
Consumer real estate | Revolving Loans | Greater than or equal to 620 and less than 680          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 516   516   507
Consumer real estate | Revolving Loans | Greater than or equal to 680 and less than 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 2,810   2,810   2,747
Consumer real estate | Revolving Loans | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 16,209   16,209   16,576
Consumer real estate | Revolving Loans Converted to Term Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 4,580   4,580   5,183
Gross charge-offs, Revolving Loans Converted to Term Loans     5   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 293   293   328
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 456   456   531
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 1,099   1,099   1,262
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 2,732   2,732   3,062
Less than or equal to 90 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,360   25,360   26,395
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 1,163   1,163   1,304
Less than or equal to 90 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 19,658   19,658   19,960
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 4,539   4,539   5,131
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 76   76   62
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 17   17   20
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 45   45   24
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 14   14   18
Greater than 100 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 100   100   106
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 37   37   37
Greater than 100 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 36   36   35
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 $ 27   $ 27   $ 34