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STOCK-BASED COMPENSATION - Schedule of Cash Proceeds Received and Tax Benefit from Share-based Payment Awards, Options (Details) - Employee Stock Option - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received for option exercises | $ 9 | $ 14 | $ 49
Intrinsic value of options exercised | 14 | 15 | 27
Tax benefits related to option exercises | $ 3 | $ 5 | $ 4

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