Debt - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2025	Jan. 31, 2025	Jan. 31, 2025	Jan. 31, 2024	Oct. 03, 2024	Jul. 31, 2024	Oct. 07, 2022
Schedule Of Long-Term And Short-Term Debt [Line Items]
Subtotal		$ 4,375,000,000	$ 4,375,000,000			$ 3,950,000,000
Repayments of debt			2,100,000,000	$ 1,155,000,000
Line of Credit | Revolving Credit Facility
Schedule Of Long-Term And Short-Term Debt [Line Items]
Line of credit facility		1,350,000,000	1,350,000,000
Borrowings outstanding		0	$ 0
Unsecured senior notes
Schedule Of Long-Term And Short-Term Debt [Line Items]
Debt instrument, face amount					$ 750,000,000
Redemption price (percentage)			100.00%
Receivables Facility | Receivables Facility
Schedule Of Long-Term And Short-Term Debt [Line Items]
Line of credit facility		1,100,000,000	$ 1,100,000,000
Swingline adjustment			100,000,000
Subtotal		$ 575,000,000	$ 575,000,000
Interest rate (in percent)		5.35%	5.35%
Term Loan | Term Loan
Schedule Of Long-Term And Short-Term Debt [Line Items]
Subtotal		$ 0	$ 0			500,000,000	$ 500,000,000
Private placement notes, 2024 | Private placement notes
Schedule Of Long-Term And Short-Term Debt [Line Items]
Repayments of debt		$ 150,000,000
Interest rate (in percent)		3.44%	3.44%
Private placement notes, 2024 | Private placement notes | Forecast
Schedule Of Long-Term And Short-Term Debt [Line Items]
Repayments of debt	$ 400,000,000
2034 Senior Notes, 5.00% due October 2034 | Unsecured senior notes
Schedule Of Long-Term And Short-Term Debt [Line Items]
Subtotal		$ 750,000,000	$ 750,000,000			$ 0
Interest rate (in percent)					5.00%