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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable on loans and leases held for investment | $ 530 |  | $ 530 |  | $ 495
Interest income on direct financing lease | 19 | $ 20 | 37 | $ 40 |
Retail | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  | 492 |  |  |
Retail | Education |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 691 | $ 99 | 909 | 300 |
Retail | Other retail |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 255 |  | 527 |  |
Retail | Retail loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  |  | 1,500 | 628 |
Retail | Retail TDRs |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  |  |  | 22 |
Retail | Residential mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds | 25,500 |  | 25,500 |  | 25,300
Consumer And Commercial Portfolio Segment | Auto, commercial and commercial real estate loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window | 40,900 |  | 40,900 |  | $ 17,400
Commercial | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans | $ 71 |  | $ 262 | $ 182 |

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