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DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (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
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | $ 42,311 |  | $ 42,311 |  | $ 45,809
Increase (decrease) to net interest income due to derivative adjustment | (38) | $ (57) | (63) | $ (195) |
Other long term debt |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 10,599 |  | 10,599 |  | 11,347
Not Designated as Hedging Instrument, Economic Hedge |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 175 |  | 175 |  | 175
Not Designated as Hedging Instrument, Economic Hedge | Other long term debt |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 0 |  | 0 |  | 0
Fair Value Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 15,886 |  | 15,886 |  | 22,334
Fair Value Hedges | Derivatives designated as Hedging Instruments | Other long term debt |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 10,599 |  | 10,599 |  | 11,347
Cash Flow Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 26,250 |  | 26,250 |  | 23,300
Cash Flow Hedges | Derivatives designated as Hedging Instruments | Other long term debt |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 0 |  | 0 |  | 0
Investment securities |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 5,287 |  | 5,287 |  | 10,987
Investment securities | Not Designated as Hedging Instrument, Economic Hedge |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 0 |  | 0 |  | 0
Investment securities | Fair Value Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 5,287 |  | 5,287 |  | 10,987
Investment securities | Cash Flow Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 0 |  | 0 |  | 0
Loans |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 26,425 |  | 26,425 |  | 23,475
Loans | Not Designated as Hedging Instrument, Economic Hedge |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 175 |  | 175 |  | 175
Loans | Fair Value Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | 0 |  | 0 |  | 0
Loans | Cash Flow Hedges | Derivatives designated as Hedging Instruments |  |  |  |  |
Notional Disclosures [Abstract] |  |  |  |  |
Notional Value | $ 26,250 |  | $ 26,250 |  | $ 23,300

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