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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable on loans and leases held for investment |  | $ 850 |  | $ 875
Loans pledged as collateral for FHLB borrowed funds | [1] | 141,102 |  | 143,861
Interest income on direct financing lease |  | 11 | $ 12 |
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 |  | 36,300 |  | 36,000
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 |  | $ 31,100 |  | $ 31,900
[1] | Includes amounts in consolidated VIEs. See Note 6 for additional information.

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