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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable on loans and leases held for investment | $ 444 |  | $ 449
Interest income on direct financing lease | 13 | $ 18 |
Commercial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of loans | 326 | 191 |
Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Payments for purchase of loans | 301 | 218 |
Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Payments for purchase of loans | 177 | 272 |
Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of loans |  | $ 1,500 |
Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans pledged as collateral for FHLB borrowed funds | 25,300 |  | 25,500
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 | $ 40,700 |  | $ 40,000

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