Goodwill and Intangible Assets - Schedule of Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Carrying value of intangible assets		$ 98	$ 133
Accumulated amortization of intangible assets		28	33
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Carrying value of intangible assets	[1]	36	62
Accumulated amortization of intangible assets	[1]	7	12
Developed Technologies [Member] | Purification Solutions [Member]
Finite Lived Intangible Assets [Line Items]
Carrying value of intangible assets		25
Accumulated amortization of intangible assets		5
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Carrying value of intangible assets	[1]	2	11
Accumulated amortization of intangible assets	[1]		$ 1
Trademarks [Member] | Purification Solutions [Member]
Finite Lived Intangible Assets [Line Items]
Carrying value of intangible assets		8
Accumulated amortization of intangible assets		$ 1

[1] Developed technologies intangible assets with a carrying value of $25 million and accumulated amortization of $5 million and trademark intangible assets with a carrying value of $8 million and accumulated amortization of $1 million related to the Purification Solutions business were classified as assets held for sale as of December 31, 2021.