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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 122,195 | $ 123,090
SBA Guaranteed PPP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 5,100 | 4,200
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 60,413 | 60,793
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 44,058 | 44,173
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,553 | 14,652
Commercial | Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,802 | 1,968
Commercial | SBA Guaranteed PPP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 5,100 |
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 61,782 | 62,297
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 19,202 | 19,539
Retail | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 11,854 | 12,149
Retail | Automobile |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,344 | 12,153
Retail | Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,691 | 12,308
Retail | Other retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 5,691 | $ 6,148

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