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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases | [1],[2] | $ 114,720 |  | $ 114,720 |  | $ 110,617
LIHTC Investments |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Net impairment losses recognized in earnings |  | 0 | $ 0 | 0 | $ 0 |
Commercial | Special Purpose Entities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases |  | 449 |  | 449 |  | $ 0
Undrawn commitments to extend credit | Special Purpose Entities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Commitment amount |  | $ 534 |  | $ 534 |  |
[1] | Excluded from the table above are loans held for sale totaling $1.3 billion and $718 million as of September 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 $67.5 billion and $20.3 billion at September 30, 2018 and December 31, 2017, respectively.

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