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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases $ 1,075,800   $ 1,075,800   $ 1,053,732
Total gross charge-offs 1,800 $ 1,187 5,317 $ 3,367  
Consumer real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total gross charge-offs 15 $ 15 34 $ 44  
Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,483   25,483   25,527
Total gross charge-offs     16   36
Consumer real estate | Home equity | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 633   633   654
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 1,092   1,092   1,107
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 4,290   4,290   4,340
Consumer real estate | Home equity | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 19,468   19,468   19,426
Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 810   810   1,103
Total gross charge-offs     6   4
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 71   71   123
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 86   86   118
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 168   168   240
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 485   485   622
Consumer real estate | Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 510   510   763
Consumer real estate | Home Equity Loan no Longer Originated          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 300   300   340
Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 21,143   21,143   20,451
Gross charge-offs, Revolving Loans     5   21
Consumer real estate | Revolving Loans | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 299   299   253
Consumer real estate | Revolving Loans | Greater than or equal to 620 and less than 680          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 661   661   589
Consumer real estate | Revolving Loans | Greater than or equal to 680 and less than 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 3,300   3,300   3,156
Consumer real estate | Revolving Loans | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 16,883   16,883   16,453
Consumer real estate | Revolving Loans Converted to Term Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 3,530   3,530   3,973
Gross charge-offs, Revolving Loans Converted to Term Loans     5   11
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 263   263   278
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 345   345   400
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 822   822   944
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 2,100   2,100   2,351
Less than or equal to 90 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,399   25,399   25,378
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 806   806   1,051
Less than or equal to 90 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 21,078   21,078   20,380
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 3,515   3,515   3,947
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 40   40   61
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 3   3   17
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 33   33   35
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 4   4   9
Greater than 100 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 44   44   88
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 1   1   35
Greater than 100 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 32   32   36
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 $ 11   $ 11   $ 17