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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 123,090 | $ 119,088
SBA Guaranteed PPP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 4,200 |
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 60,793 | 57,538
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 44,173 | 41,479
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,652 | 13,522
Commercial | Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,968 | 2,537
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 62,297 | 61,550
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 19,539 | 19,083
Retail | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,149 | 13,154
Retail | Automobile |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,153 | 12,120
Retail | Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,308 | 10,347
Retail | Other retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 6,148 | $ 6,846

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