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Debt and Financing Arrangements (Details) - USD ($) | Apr. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Short-Term Debt [Line Items] |  |  |
Short-term debt |  | $ 2,210,000,000 | $ 385,000,000
Weighted average interest rate on short-term debt outstanding |  | 4.70% | 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 |
$700 Million Bond Expiring April 2029 | Subsequent Event |  |  |
Short-Term Debt [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 5.50% |  |
Debt instrument, face amount | $ 700,000,000 |  |
Commercial paper |  |  |
Short-Term Debt [Line Items] |  |  |
Short-term debt |  | 1,784,000,000 | $ 200,000,000
Term loans |  |  |
Short-Term Debt [Line Items] |  |  |
Short-term debt |  | 424,000,000 | 159,000,000
Bank borrowings |  |  |
Short-Term Debt [Line Items] |  |  |
Short-term debt |  | $ 2,000,000 | $ 26,000,000

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