Restructuring and Impairment Costs - Narrative (Details) employee in Thousands, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) employee plant	Mar. 31, 2022 USD ($) employee	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) employee	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Noncash adjustment—underspend/other							$ 20
Restructuring reserve	$ 73	$ 73		$ 73		$ 115
Restructuring and impairment costs		$ 4	$ 5	$ 8	$ 12
Number of positions eliminated to date | employee	15	15		15
Number of positions eliminated | employee	14
Number of plants expected to close | plant	26
Number of plants closed | plant	20
2022 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 7	$ 7		$ 7
Noncash adjustment—underspend/other				8
Restructuring reserve	5	5		5		7
Utilized—cash				2
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs						27
Noncash adjustment—underspend/other				(1)		16
Restructuring reserve	9	9		9		22
Utilized—cash				12
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				(8)
Restructuring reserve	49	49		49		$ 77
Restructuring and impairment costs							205
Utilized—cash				20
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				1
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2	2		2
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2	2		2
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1	$ 1		$ 1