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LOANS AND LEASES - 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
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | $ 1,303 |  | $ 1,303 |  | $ 497
Other loans held for sale | 27 |  | 27 |  | 221
Level 2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 1,303 |  | 1,303 |  | 497
Other loans held for sale | 0 |  | 0 |  | 0
Residential loans held for sale | Level 2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 1,140 |  | 1,140 |  | 326
Commercial real estate loans held for sale | Level 2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 163 |  | 163 |  | 171
Retail | Education |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 98 | $ 63 | 321 | $ 795 |
Retail | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  | $ 0 |  | 206 |
Retail | Automobile |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans |  |  |  | 153 |
Retail | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds | 25,300 |  | 25,300 |  | 24,900
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window | $ 18,700 |  | 18,700 |  | $ 18,100
Commercial | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  |  | $ 553 | $ 596 |

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- Definition The carrying amount, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of FHLB debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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