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, 2023
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases $ 1,046,406   $ 1,045,747
Gross charge-offs 1,056 $ 734  
Consumer real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Gross charge-offs 14 $ 23  
Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 25,868   26,563
Gross charge-offs 6   45
Consumer real estate | Home equity | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 677   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 1,138   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 4,186   4,321
Consumer real estate | Home equity | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 19,867   20,369
Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 1,295   1,361
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 167   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 144   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 292   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 692   731
Consumer real estate | Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 893   937
Consumer real estate | Home Equity Loan no Longer Originated      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 402   424
Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 19,700   20,019
Gross charge-offs, Revolving Loans 3   24
Consumer real estate | Revolving Loans | Less than 620      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 197   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 504   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 2,728   2,747
Consumer real estate | Revolving Loans | Greater than or equal to 740      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 16,271   16,576
Consumer real estate | Revolving Loans Converted to Term Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans Converted to Term Loans 4,873   5,183
Gross charge-offs, Revolving Loans Converted to Term Loans 2   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 313   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 490   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 1,166   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 2,904   3,062
Less than or equal to 90 percent | Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 25,692   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 1,238   1,304
Less than or equal to 90 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 19,627   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 4,827   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 72   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 21   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 35   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 16   18
Greater than 100 percent | Consumer real estate | Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 104   106
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans and leases 36   37
Greater than 100 percent | Consumer real estate | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Revolving Loans 38   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 $ 30   $ 34