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Debt and Financing Arrangements - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 8,568,000,000 | $ 8,462,000,000 |
Interest paid | 361,000,000 | $ 288,000,000 | $ 222,000,000
$2.5 Billion Facility Expiring Dec 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | 2,500,000,000 |  |
$500 million facility expiring Nov 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | 500,000,000 |  |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 0 |  |

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