Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,678	$ 1,705	$ 1,484
Other Comprehensive (Loss) Income, Net of Tax
Foreign currency translation adjustments	(109)	(166)	(91)
Defined benefit pension and postretirement plans	(79)	14	4
Cash flow hedges	24	(32)	27
Unrealized gain (loss) on available-for-sale debt securities	1	(1)	0
Other Comprehensive Loss, Net of Tax	(163)	(184)	(60)
Comprehensive Income	$ 1,515	$ 1,521	$ 1,424