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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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