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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 125,713 | $ 119,088
Loans held for sale, at fair value | 3,631 | 1,946
Other loans held for sale | 1,362 | 1,384
SBA Loans Serviced For Others | CBNA and Other Subsidiaries |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 45 | 33
Mortgage loans serviced for others | CBNA and Other Subsidiaries |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 79,900 | 77,500
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 64,930 | 57,538
Commercial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 48,017 | 41,479
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 14,485 | 13,522
Commercial | Leases |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 2,428 | 2,537
Commercial | SBA Guaranteed PPP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 4,700 |
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 60,783 | 61,550
Retail | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 19,245 | 19,083
Retail | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,541 | 13,154
Retail | Automobile |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,028 | 12,120
Retail | Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 10,591 | 10,347
Retail | Other retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 6,378 | $ 6,846

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