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EQUITY METHOD INVESTMENT AND NOTE RECEIVABLE - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 13, 2024 | Aug. 02, 2024 | Jun. 06, 2024 | May 31, 2023 | Aug. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Pre-tax cash proceeds from divestiture of business |  |  |  |  |  | $ 0 | $ 0 | $ 17
Interest income |  |  |  |  |  | 148 | 227 | 34
Loss on Copeland note receivable |  |  |  |  |  | 279 | 0 | 0
Loss on Copeland note receivable, after-tax |  |  |  |  |  | $ 217 |  |
Loss from equity method investment (in dollars per share) |  |  |  |  |  | $ 0.38 |  |
Related Party |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from related party note receivable |  |  |  |  |  | $ 0 | 918 | 0
Payment of related party note payable |  |  |  |  |  | 0 | 918 | $ 0
Copeland |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment |  |  |  | $ 1,359 |  |  |  |
Notes receivable |  |  |  | $ 2,052 |  |  |  |
Proceeds from related party note receivable |  |  |  |  |  |  | 918 |
Payment of related party note payable |  |  |  |  |  |  | 918 |
Copeland | Related Party |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  | $ 86 | $ 41 |
Copeland |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Noncontrolling common equity interest |  |  | 40.00% | 40.00% |  | 40.00% | 40.00% |
Copeland |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Pre-tax cash proceeds from divestiture of business |  |  |  | $ 9,700 |  | $ 1,500 |  |
Notes receivable, consideration |  |  |  | $ 2,250 |  | $ 1,900 |  |
Proceeds from sale of equity method investments | $ 1,500 |  | $ 1,500 |  | $ 1,500 |  |  |
Proceeds from sale of notes receivable |  | $ 1,900 | $ 1,900 |  |  |  |  |

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