Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2021	$ 2,212
Currency translation and other	(14)
Balance at March 31, 2022	2,198
Americas
Goodwill [Roll Forward]
Balance at September 30, 2021	607
Currency translation and other	4
Balance at March 31, 2022	611
EMEA
Goodwill [Roll Forward]
Balance at September 30, 2021	354
Currency translation and other	(14)
Balance at March 31, 2022	340
Asia
Goodwill [Roll Forward]
Balance at September 30, 2021	1,251
Currency translation and other	(4)
Balance at March 31, 2022	$ 1,247