Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 874	$ 1,233	$ 311
Other Comprehensive (Loss) Income, Net of Tax
Foreign currency translation adjustments	(161)	(93)	(161)
Defined benefit pension and postretirement plans	(35)	(275)	(26)
Cash flow hedges	(67)	(6)	1
Other Comprehensive Loss, Net of Tax	(265)	(374)	(186)
Comprehensive Income	$ 609	$ 859	$ 125