Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Parenthetical) (Detail) - Pension Benefits [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	[1],[2]	$ 27	$ 686	$ 1,015
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		$ 6	$ 698	$ 962

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

[2] In 2023, 2022, and 2021, net periodic benefit cost for U.S pension plans was $6, $698, and $962, respectively.