Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,092	$ 874	$ 1,233
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustments	124	(161)	(93)
Defined benefit pension and postretirement plans	255	(35)	(275)
Cash flow hedges	81	(67)	(6)
Other Comprehensive Income (Loss), Net of Tax	460	(265)	(374)
Comprehensive Income	$ 2,552	$ 609	$ 859