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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Short-Term Debt, Gross [Line Items] |  |
Short-term Borrowings Gross | $ 0 | $ 1,168
Weighted average interest rate - discount notes | 0.00% | 4.76%
Foreign Currency Transaction Gain (Loss), Unrealized | $ 59 | $ 62

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