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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest receivable on loans and leases held for investment | $ 733 |  | $ 733 |  | $ 450
Loans pledged as collateral for FHLB borrowed funds | 154,160 |  | 154,160 |  | 126,405
Interest income on direct financing lease | 13 | $ 12 | 34 | $ 37 |
Retail | Residential mortgages | Pledged as collateral for FHLB borrowing capacity |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds | 38,200 |  | 38,200 |  | 26,100
Consumer and Commercial Portfolio Segment | Auto, commercial and commercial real estate loans | Notes Payable, Other Payables |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds | $ 36,200 |  | $ 36,200 |  | $ 35,800

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