Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 2	$ 2
Interest cost	[1]	27	31
Expected return on plan assets	[1]	(35)	(39)
Recognized net actuarial loss	[1]	8	7
Curtailments	[2]	1
Net periodic benefit cost		3	1
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1
Interest cost	[1]	6	6
Recognized net actuarial loss	[1]	1	1
Amortization of prior service benefit	[1]	(3)	(3)
Net periodic benefit cost		$ 5	$ 5

[1] These amounts were reported in Other 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.