Goodwill and Other Intangible Assets - Intangible Assets Deemed to Indefinite Life that are Therefore Not Amortized (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 38	$ 34
Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	7	7
Use Rights
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	29	25
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2	2
Building Materials Business
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	36	32
Building Materials Business | Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	7	7
Building Materials Business | Use Rights
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	29	25
Building Materials Business | Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	0	0
Magnesia Specialties
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2	2
Magnesia Specialties | Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	0	0
Magnesia Specialties | Use Rights
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	0	0
Magnesia Specialties | Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 2	$ 2