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Loan Portfolio - Loans by Category (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 100,926 | $ 101,185
Accrued interest | 242 | 241
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 71,414 | 71,980
Accrued interest | 143 | 140
Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 29,512 | 29,205
Accrued interest | 98 | 101
Commercial and Industrial | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 52,486 | 52,907
Commercial mortgage | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 12,702 | 12,687
Construction | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,122 | 1,987
Commercial real estate loans | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 14,824 | 14,674
Commercial lease financing | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,104 | 4,399
Real estate — residential mortgage | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 10,300 | 9,298
Home equity loans | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 9,158 | 9,360
Residential - Prime Loans | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 19,458 | 18,658
Consumer direct loans | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,862 | 4,714
Credit cards | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 909 | 989
Consumer indirect loans | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,283 | 4,844
Commercial credit card | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 126 | 127
Commercial credit card | Consumer Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 909 | 989
Collateral pledged | Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 21 | 23
Education Lending | Discontinued Operations |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 675 | $ 710

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