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Debt and Financing Arrangements (Details) - USD ($)	Jun. 30, 2024	Apr. 30, 2024	Sep. 30, 2023
Short-Term Debt [Line Items]
Short-term debt	$ 1,523,000,000		$ 385,000,000
Weighted average interest rate on short-term debt outstanding	4.50%		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
Short-Term Debt [Line Items]
Debt instrument, face amount		$ 700,000,000
Debt instrument, interest rate, stated percentage		5.50%
5.125% Notes due 2045
Short-Term Debt [Line Items]
Debt tender offer	$ 119,000,000
Debt instrument, interest rate, stated percentage	5.125%
Commercial paper
Short-Term Debt [Line Items]
Short-term debt	$ 941,000,000		$ 200,000,000
Term loans
Short-Term Debt [Line Items]
Short-term debt	581,000,000		159,000,000
Bank borrowings
Short-Term Debt [Line Items]
Short-term debt	$ 1,000,000		$ 26,000,000

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