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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | $ 521 |  | $ 521 |  | $ 497
Other loans held for sale | 189 |  | 189 |  | 221
Level 2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 521 |  | 521 |  | 497
Other loans held for sale | 0 |  | 0 |  | 0
Level 2 | Residential loans held for sale |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 365 |  | 365 |  | 326
Level 2 | Commercial real estate loans held for sale |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for sale | 156 |  | 156 |  | 171
Retail | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  | $ 206 |  | $ 206 |
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 | 18,000 |  | 18,000 |  | $ 18,100
Commercial | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans | $ 353 | $ 596 | $ 553 | $ 596 |

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