Debt (Narrative) (Details)	1 Months Ended		9 Months Ended
	Jun. 30, 2025 USD ($) renewal_option	Apr. 30, 2025 USD ($)	Nov. 01, 2025 USD ($) note	Nov. 02, 2024 USD ($) note	May 31, 2025 USD ($)	Feb. 01, 2025 USD ($) note
Debt Instrument [Line Items]
Payment of long-term debt			$ 700,000,000	$ 250,000,000
Senior Notes
Debt Instrument [Line Items]
Number of series notes | note			5	6		6
Senior Notes | Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Unsecured senior notes estimated fair value			$ 1,400,000,000	$ 2,100,000,000		$ 2,100,000,000
Unsecured Debt | Standby Letters of Credit
Debt Instrument [Line Items]
Amount outstanding			$ 0
4.600% Senior Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Payment of long-term debt		$ 700,000,000
Unsecured senior notes interest rate (percent)		4.60%	4.60%
2025 Credit Facility | Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,300,000,000
Number of renewal options | renewal_option	2
Renewal option, term	1 year
Option to increase credit facility, additional amount (up to)	$ 700,000,000
Remaining borrowing capacity			$ 1,300,000,000
2025 Credit Facility | Unsecured Debt | Standby Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000
Prior Unsecured Credit Facility | Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,300,000,000