Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Parenthetical) (Detail) - Pension Benefits [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	[1],[2]	$ 9	$ 27	$ 686
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		$ 7	$ 6	$ 698

[1] Amounts attributed to joint venture partners are not included.

[2] In 2024, 2023, and 2022, net periodic benefit cost for U.S pension plans was $7, $6, and $698, respectively.