Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 979,124 $ 927,861
Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 27,935 34,311
Consumer real estate | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 893 1,082
Consumer real estate | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,434 1,798
Consumer real estate | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 4,625 5,762
Consumer real estate | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 20,983 25,669
Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,913 2,217
Consumer real estate | Home Equity Loans and Reverse Mortgages | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 244 250
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 222 263
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 468 556
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 979 1,148
Consumer real estate | Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,300 1,300
Consumer real estate | Home Equity Loan no Longer Originated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 582 885
Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 19,183 22,851
Consumer real estate | Revolving Loans | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 209 244
Consumer real estate | Revolving Loans | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 495 568
Consumer real estate | Revolving Loans | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 2,493 2,905
Consumer real estate | Revolving Loans | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 15,986 19,134
Consumer real estate | Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans Converted to Term Loans 6,839 9,243
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 440 588
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 717 967
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 1,664 2,301
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 4,018 5,387
Less than or equal to 90 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 27,594 33,447
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 1,773 1,919
Less than or equal to 90 percent | Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 19,095 22,639
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 6,726 8,889
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 130 351
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 55 126
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 34 94
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 41 131
Greater than 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 211 513
Greater than 100 percent | Consumer real estate | Home Equity Loans and Reverse Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 85 172
Greater than 100 percent | Consumer real estate | Revolving Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving Loans 54 118
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 $ 72 $ 223