Debt - Additional Information (Details) € in Billions	1 Months Ended			12 Months Ended
	May 31, 2025 EUR (€)	May 31, 2025 USD ($)	May 31, 2023 USD ($)	Sep. 30, 2025 USD ($)	May 31, 2025 USD ($)	Sep. 30, 2024 USD ($)
Commercial Paper Program
Debt Instrument [Line Items]
Debt term (in years)				397 days
Debt instrument, maximum borrowing capacity				$ 3,000,000,000.0
Commercial paper program, amount outstanding				$ 0		$ 0
Senior Notes | Europe
Debt Instrument [Line Items]
Aggregate principal	€ 3.5				$ 3,900,000,000
Net aggregate proceeds	€ 3.5	$ 3,900,000,000
Senior Notes | Europe | Minimum
Debt Instrument [Line Items]
Debt term (in years)	3 years	3 years
Senior Notes | Europe | Maximum
Debt Instrument [Line Items]
Debt term (in years)	19 years	19 years
Senior Notes | 2.25% Senior Notes due May 2028 | Europe
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.25%			2.25%	2.25%
Senior Notes | 3.125% Senior Notes due May 2033 | Europe
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.125%			3.125%	3.125%
Senior Notes | 3.50% Senior Notes due May 2037 | Europe
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.50%			3.50%	3.50%
Senior Notes | 3.875% Senior Notes due May 2044 | Europe
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.875%			3.875%	3.875%
Line of Credit | Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt term (in years)			5 years
Maximum borrowing capacity			$ 7,000,000,000.0
Amounts outstanding under credit facility				$ 0		$ 0