Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016
Other Liabilities Disclosure [Abstract]
Asbestos-related liabilities (see Note 21)	$ 125	$ 136
Restructuring (see Note 7)	1	2	$ 3
Non-current deferred income tax liabilities	13	12
Liabilities for uncertain tax positions	14	16
Product warranties (see Note 16)	24	26	$ 28
Environmental (see Note 21)	5	6
Indemnity obligations (see Note 21)	11	11
Other	26	29
Other liabilities	$ 219	$ 238