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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases $ 1,049,156   $ 1,053,732
Total gross charge-offs 1,738 $ 1,056  
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross charge-offs 11 $ 14  
Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 25,185   25,527
Total gross charge-offs 3   36
Consumer real estate | Home equity | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 681   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 1,085   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 4,258   4,340
Consumer real estate | Home equity | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 19,161   19,426
Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 1,067   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 121   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 115   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 228   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 603   622
Consumer real estate | Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 740   763
Consumer real estate | Home Equity Loan no Longer Originated      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 327   340
Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 20,324   20,451
Gross charge-offs, Revolving Loans 1   21
Consumer real estate | Revolving Loans | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 279   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 593   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 3,142   3,156
Consumer real estate | Revolving Loans | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 16,310   16,453
Consumer real estate | Revolving Loans Converted to Term Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans Converted to Term Loans 3,794   3,973
Gross charge-offs, Revolving Loans Converted to Term Loans 2   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 281   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 377   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 888   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 2,248   2,351
Less than or equal to 90 percent | Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 25,045   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 1,021   1,051
Less than or equal to 90 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 20,252   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 3,772   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 62   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 14   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 40   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 8   9
Greater than 100 percent | Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 78   88
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 32   35
Greater than 100 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 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 $ 14   $ 17