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LOANS AND LEASES - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable on loans and leases held for investment | $ 464,000,000 |  | $ 464,000,000 |  | $ 449,000,000
Interest income on direct financing lease | 12,000,000 | $ 17,000,000 | 37,000,000 | $ 54,000,000 |
Retail | Education |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 323,000,000 | 801,000,000 | 975,000,000 | 1,700,000,000 |
Proceeds from sale of loans | 0 | 879,000,000 | 0 | 879,000,000 |
Retail | Other retail |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 119,000,000 | 101,000,000 | 472,000,000 | 628,000,000 |
Retail | Residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payments for purchase of loans | 478,000,000 | 0 | 478,000,000 | 0 |
Retail | Consumer Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans |  |  |  | 1,500,000,000 |
Retail | Residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds | 25,200,000,000 |  | 25,200,000,000 |  | 25,500,000,000
Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of loans | 202,000,000 | $ 94,000,000 | 765,000,000 | $ 356,000,000 |
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 | $ 38,100,000,000 |  | $ 38,100,000,000 |  | $ 40,000,000,000

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