Restructuring and Impairment Costs - Narrative (Details) employee in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) employee	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) plant employee	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Noncash adjustment—underspend/other						$ 20
Restructuring reserve	$ 70		$ 70		$ 115
Restructuring and impairment costs	$ 12	$ 8	$ 20	$ 20
Number of positions eliminated to date | employee	15		15
Number of positions eliminated | employee			14
Number of plants expected to close | plant			29
Number of plants closed | plant			21
2022 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 20		$ 20
Noncash adjustment—underspend/other			(1)
Restructuring reserve	14		14		20
Utilized—cash			5
Restructuring and Related Cost, Expected Cost Adjustment	8		8
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					27
Noncash adjustment—underspend/other			(2)		16
Restructuring reserve	5		5		22
Utilized—cash			15
2021 Restructuring Plan | EMEA
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					23
2021 Restructuring Plan | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring reserve					3
2021 Restructuring Plan | Asia
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs					1
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Noncash adjustment—underspend/other			(12)
Restructuring reserve	42		42		$ 77
Restructuring and impairment costs						205
Utilized—cash			23
2020 Restructuring Plan | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs						175
2020 Restructuring Plan | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs						20
2020 Restructuring Plan | Asia
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs						$ 10
Restructuring Plan 2018, 2017, 2016
Restructuring Cost and Reserve [Line Items]
Utilized—cash			2
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2		2
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2		2
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1		$ 1