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Debt - Schedule of Debt Issuances (Details) € in Millions, $ in Millions	Sep. 30, 2025	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€)
5.081% Notes due June 7, 2029
Debt Instrument [Line Items]
Interest rate (percent)	5.081%
Debt instrument, face amount		$ 600
4.874% Notes due February 8, 2029
Debt Instrument [Line Items]
Interest rate (percent)	4.874%
Debt instrument, face amount		$ 625
3.363% Notes due June 6, 2024
Debt Instrument [Line Items]
Interest rate (percent)		3.363%	3.363%
3.734% Notes due December 15, 2024
Debt Instrument [Line Items]
Interest rate (percent)	3.734%
5.110% Notes due February 8, 2034
Debt Instrument [Line Items]
Interest rate (percent)	5.11%
Debt instrument, face amount		$ 550
3.828% Notes due June 7, 2032
Debt Instrument [Line Items]
Interest rate (percent)	3.828%
3.828% Notes due June 7, 2032 | Euro Member Countries, Euro
Debt Instrument [Line Items]
Debt instrument, face amount | €			€ 1,000
3.828% Notes due June 7, 2032 | United States of America, Dollars
Debt Instrument [Line Items]
Debt instrument, face amount		1,087
3.519% Notes due February 8, 2031
Debt Instrument [Line Items]
Interest rate (percent)	3.519%
3.519% Notes due February 8, 2031 | Euro Member Countries, Euro
Debt Instrument [Line Items]
Debt instrument, face amount | €			€ 750
3.519% Notes due February 8, 2031 | United States of America, Dollars
Debt Instrument [Line Items]
Debt instrument, face amount		$ 806
3.875% Notes due May 15, 2024
Debt Instrument [Line Items]
Interest rate (percent)		3.875%	3.875%
4.029% Notes due June 7, 2036
Debt Instrument [Line Items]
Interest rate (percent)	4.029%
4.029% Notes due June 7, 2036 | Euro Member Countries, Euro
Debt Instrument [Line Items]
Debt instrument, face amount | €			€ 800
4.029% Notes due June 7, 2036 | United States of America, Dollars
Debt Instrument [Line Items]
Debt instrument, face amount		$ 869

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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