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Goodwill - Summary of Goodwill which is Included in Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 145	$ 145
Other Noncurrent Assets [Member]
Goodwill [Line Items]
Goodwill	145	145
Alumina [Member] \| Other Noncurrent Assets [Member]
Goodwill [Line Items]
Goodwill	4	4
Corporate Segment [Member] \| Other Noncurrent Assets [Member]
Goodwill [Line Items]
Goodwill	$ 141	$ 141

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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