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Debt and Financing Arrangements (Details) - USD ($) | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Short-Term Debt [Line Items] |  |
Short-term debt | $ 1,998,000,000 | $ 385,000,000
Weighted average interest rate on short-term debt outstanding | 4.40% | 5.10%
Revolving Credit Facility |  |
Short-Term Debt [Line Items] |  |
Long-term debt | $ 0 |
$2.5 Billion Facility Expiring Dec 2024 |  |
Short-Term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 2,500,000,000 |
$500 Million Facility Expiring Nov 2023 |  |
Short-Term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 500,000,000 |
Commercial paper |  |
Short-Term Debt [Line Items] |  |
Short-term debt | 1,383,000,000 | $ 200,000,000
Term loans |  |
Short-Term Debt [Line Items] |  |
Short-term debt | 598,000,000 | 159,000,000
Bank borrowings |  |
Short-Term Debt [Line Items] |  |
Short-term debt | $ 17,000,000 | $ 26,000,000

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