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LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accrued interest receivable on loans and leases held for investment |  | $ 857 |  | $ 857 |  | $ 816
Loans pledged as collateral for FHLB borrowed funds | [1] | 138,898 |  | 138,898 |  | 137,142
Interest income on direct financing lease |  | 11 | $ 11 | 33 | $ 31 |
Retail | Residential mortgages | Federal Home Loan Bank Advances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral for FHLB borrowed funds |  | 40,600 |  | 40,600 |  | 37,500
Consumer and Commercial Portfolio Segment | Education, commercial and industrial, 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 |  | $ 20,000 |  | $ 20,000 |  | $ 22,900
[1] | Includes amounts in consolidated VIEs. See Note 6 for additional information.

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