Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (115)	$ (49)	$ (245)	$ (68)
Other comprehensive (loss) income:
Pension, postretirement and postemployment benefit-related items, net of income taxes of $(10) and $1 for the three and nine months ended June 30, 2016 and $7 and $18 for the three and nine months ended June 30, 2015, respectively	(79)	10	(61)	34
Cumulative translation adjustment, net of income taxes of $(6) and $0 for the three and nine months ended June 30, 2016 and $0 and $0 for the three and nine months ended June 30, 2015, respectively	10	(25)	(10)	51
Other comprehensive (loss) income	(69)	(15)	(71)	85
Comprehensive (loss) income	$ (184)	$ (64)	$ (316)	$ 17