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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases $ 1,056,785   $ 1,056,785   $ 1,053,732
Total gross charge-offs 1,779 $ 1,125 3,517 $ 2,180  
Consumer real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total gross charge-offs 8 $ 15 19 $ 29  
Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,442   25,442   25,527
Total gross charge-offs     6   36
Consumer real estate | Home equity | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 645   645   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 1,087   1,087   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 4,293   4,293   4,340
Consumer real estate | Home equity | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 19,417   19,417   19,426
Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 1,006   1,006   1,103
Total gross charge-offs     0   4
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 97   97   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 111   111   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 211   211   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 587   587   622
Consumer real estate | Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 694   694   763
Consumer real estate | Home Equity Loan no Longer Originated          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 312   312   340
Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 20,793   20,793   20,451
Gross charge-offs, Revolving Loans     3   21
Consumer real estate | Revolving Loans | Less than 620          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 282   282   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 620   620   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 3,226   3,226   3,156
Consumer real estate | Revolving Loans | Greater than or equal to 740          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 16,665   16,665   16,453
Consumer real estate | Revolving Loans Converted to Term Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 3,643   3,643   3,973
Gross charge-offs, Revolving Loans Converted to Term Loans     3   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 266   266   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 356   356   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 856   856   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 2,165   2,165   2,351
Less than or equal to 90 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 25,290   25,290   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 959   959   1,051
Less than or equal to 90 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 20,708   20,708   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 3,623   3,623   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 78   78   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 20   20   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 51   51   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 7   7   9
Greater than 100 percent | Consumer real estate | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 74   74   88
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans and leases 27   27   35
Greater than 100 percent | Consumer real estate | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 34   34   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 $ 13   $ 13   $ 17