Segment Information - Schedule of Long-Lived Net Property, Equipment and Technology Assets by Major Geographic Area (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total	$ 2,424	$ 2,329
U.S.
Segment Reporting Information [Line Items]
Total	1,826	1,738
International
Segment Reporting Information [Line Items]
Total	$ 598	$ 591