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SHORT-TERM BORROWINGS AND LINES OF CREDIT - Narrative (Details) - USD ($) $ in Millions | Feb. 11, 2025 | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Commercial paper |  | $ 4,192 | $ 0
Revolving Credit Facility | 364-Day Revolving Backup Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 3,000 |  |
Debt instrument, term | 364 days |  |
Revolving Credit Facility | Five Year Revolving Backup Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 3,500 |  |
Debt instrument, term | 5 years |  |

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