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DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Asset Fair Value |  |
Asset Fair Value | $ 570 | $ 660
Less: gross amounts offset in the consolidated balance sheets, asset fair value | 0 | 0
Derivative assets | 570 | 660
Liability Fair Value |  |
Liability Fair Value | (520) | (625)
Less: gross amounts offset in the consolidated balance sheets, liability fair value | 0 | 0
Derivative liability | (520) | (625)
Qualifying Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 2,834 | 4,584
Asset Fair Value |  |
Asset Fair Value | 0 | 1
Liability Fair Value |  |
Liability Fair Value | 0 | 0
Qualifying Hedges | Fair Value Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 334 | 1,084
Asset Fair Value |  |
Asset Fair Value | 0 | 0
Liability Fair Value |  |
Liability Fair Value | 0 | 0
Qualifying Hedges | Interest rate contracts | Fair Value Hedges | Time deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 134 | 334
Asset Fair Value |  |
Asset Fair Value | 0 | 0
Liability Fair Value |  |
Liability Fair Value | 0 | 0
Qualifying Hedges | Interest rate contracts | Fair Value Hedges | Long-term borrowings |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 200 | 750
Asset Fair Value |  |
Asset Fair Value | 0 | 0
Liability Fair Value |  |
Liability Fair Value | 0 | 0
Qualifying Hedges | Interest rate contracts | Cash Flow Hedges | Loans |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 2,500 | 3,500
Asset Fair Value |  |
Asset Fair Value | 0 | 1
Liability Fair Value |  |
Liability Fair Value | 0 | 0
Non-qualifying Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 37,756 | 35,394
Asset Fair Value |  |
Asset Fair Value | 570 | 659
Liability Fair Value |  |
Liability Fair Value | (520) | (625)
Non-qualifying Hedges | Interest rate contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 28,290 | 26,235
Asset Fair Value |  |
Asset Fair Value | 403 | 491
Liability Fair Value |  |
Liability Fair Value | (383) | (516)
Non-qualifying Hedges | Foreign exchange contract |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 7,969 | 7,843
Asset Fair Value |  |
Asset Fair Value | 145 | 152
Liability Fair Value |  |
Liability Fair Value | (136) | (108)
Non-qualifying Hedges | Foreign exchange spot contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 566 | 177
Liability Fair Value |  |
Net fair value | 0 | 0
Non-qualifying Hedges | Other contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional Amount | 1,497 | 1,316
Asset Fair Value |  |
Asset Fair Value | 22 | 16
Liability Fair Value |  |
Liability Fair Value | $ (1) | $ (1)

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