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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 123,318 | $ 123,090
SBA Guaranteed PPP Loans | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,900 | 4,200
FHA, VA And USDA Guaranteed Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,400 | 249
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 57,955 | 60,793
Commercial | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 53,883 | 56,156
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 41,854 | 44,173
Commercial | Commercial and industrial | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 39,218 | 40,878
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,508 | 14,652
Commercial | Commercial real estate | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 13,146 | 13,356
Commercial | Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,593 | 1,968
Commercial | Leases | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 1,519 | 1,922
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 65,363 | 62,297
Retail | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 21,513 | 19,539
Retail | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 11,889 | 12,149
Retail | Automobile |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 13,492 | 12,153
Retail | Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 13,000 | 12,308
Retail | Other retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 5,469 | $ 6,148

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