Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 537	$ 460	$ 818	$ 969
Other Comprehensive (Loss) Income, Net of Tax
Foreign currency translation adjustments	(41)	(21)	(1)	(101)
Defined benefit pension and postretirement plans	12	11	23	22
Cash flow hedges	8	(6)	(10)	(9)
Unrealized loss on available-for-sale debt securities	(1)	0	(1)	0
Other Comprehensive (Loss) Income, Net of Tax	(21)	(16)	12	(87)
Comprehensive Income	$ 516	$ 445	$ 831	$ 882