Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 2	$ 2
Interest cost	[1]	25	27
Expected return on plan assets	[1]	(31)	(35)
Recognized net actuarial loss	[1]	9	8
Curtailments	[2]		1
Net periodic benefit cost		5	3
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			1
Interest cost	[1]	5	6
Recognized net actuarial loss	[1]	1	1
Amortization of prior service benefit	[1]	(3)	(3)
Net periodic benefit cost		$ 3	$ 5

[1] These amounts were reported in Other (income) expenses, net on the accompanying Statement of Consolidated Operations (see Note P).

[2] This amount was reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.