Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2020	$ 2,057
Currency translation and other	12
Balance at June 30, 2021	2,069
Americas
Goodwill [Roll Forward]
Balance at September 30, 2020	606
Currency translation and other	4
Balance at June 30, 2021	610
EMEA
Goodwill [Roll Forward]
Balance at September 30, 2020	368
Currency translation and other	9
Balance at June 30, 2021	377
Asia
Goodwill [Roll Forward]
Balance at September 30, 2020	1,083
Currency translation and other	(1)
Balance at June 30, 2021	$ 1,082