Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019
Other Liabilities Disclosure [Abstract]
Asbestos-related liabilities (see Note 20)	$ 78	$ 82
Liabilities for uncertain tax positions	112	46
Product warranties (see Note 15)	29	32	$ 37
Other	128	66
Other liabilities	$ 347	$ 226