Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 20	$ (12)	$ 619	$ (148)
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustments	76	128	42	92
Defined benefit pension and postretirement plans	13	(90)	28	(72)
Cash flow hedges	(1)	(2)	0	(1)
Other Comprehensive Income, Net of Tax	88	36	70	18
Comprehensive Income (Loss)	$ 108	$ 24	$ 689	$ (130)