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VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Variable Interest Entity |  |  |
Lending to special purpose entities included in loans and leases | [1],[2] | $ 113,407 | $ 110,617
LIHTC Investments |  |  |
Variable Interest Entity |  |  |
LIHTC investment included in other assets |  | 1,057 | 951
LIHTC unfunded commitments included in other liabilities |  | 548 | 491
Renewable Energy |  |  |
Variable Interest Entity |  |  |
Renewable energy investments included in other assets |  | 326 | 335
Commercial | Special Purpose Entities |  |  |
Variable Interest Entity |  |  |
Lending to special purpose entities included in loans and leases |  | $ 354 | $ 0
[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 of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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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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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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