Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net (Loss) Income	$ (12)	$ 344	$ (148)	$ 905
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustments	128	136	92	(139)
Defined benefit pension and postretirement plans	(90)	15	(72)	29
Cash flow hedges	(2)	2	(1)	30
Other Comprehensive Income (Loss), Net of Tax	36	153	18	(80)
Comprehensive Income (Loss)	$ 24	$ 497	$ (130)	$ 826