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LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | [1],[2] | $ 113,407 | $ 110,617
Loans receivable held for sale |  | 710 | 718
Mortgage loans serviced for others | Banking Subsidiaries |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 21,600 | 20,300
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 54,888 | 52,031
Commercial | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 39,278 | 37,562
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 12,528 | 11,308
Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 3,082 | 3,161
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 58,519 | 58,586
Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 17,814 | 17,045
Retail | Home equity loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 1,211 | 1,392
Retail | Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 13,014 | 13,483
Retail | Home equity loans serviced by others |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 465 | 542
Retail | Home equity lines of credit serviced by others |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 124 | 149
Retail | Automobile |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 12,517 | 13,204
Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 8,450 | 8,134
Retail | Credit cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | 1,877 | 1,848
Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases |  | $ 3,047 | $ 2,789
[1] | Excluded from the table above are loans held for sale totaling $710 million and $718 million as of June 30, 2018 and December 31, 2017, respectively.
[2] | Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $21.6 billion and $20.3 billion at June 30, 2018 and December 31, 2017, respectively.

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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