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LOANS - Performance of Modified Corporate Loans (Details) - Corporate loans - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | $ 265 | $ 356
Current |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 264 | 356
30–89 days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 1 | 0
90+ days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 251 | 251
Commercial and industrial | Current |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 250 | 251
Commercial and industrial | 30–89 days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 1 | 0
Commercial and industrial | 90+ days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Financial institutions |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Financial institutions | Current |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Financial institutions | 30–89 days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Financial institutions | 90+ days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Mortgage and real estate |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 14 | 105
Mortgage and real estate | Current |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 14 | 105
Mortgage and real estate | 30–89 days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Mortgage and real estate | 90+ days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Other |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Other | Current |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Other | 30–89 days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | 0 | 0
Other | 90+ days past due |  |
Financing Receivable, Modified [Line Items] |  |
Total modified loans balance | $ 0 | $ 0

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