Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 299	$ 183	$ 1,302	$ 461
Other Comprehensive (Loss) Income, Net of Tax
Foreign currency translation adjustments	(15)	(125)	50	(99)
Defined benefit pension and postretirement plans	16	17	58	33
Cash flow hedges	83	(109)	111	(70)
Other Comprehensive Income (Loss), Net of Tax	85	(218)	219	(136)
Comprehensive Income (Loss)	$ 384	$ (35)	$ 1,521	$ 325