Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 3	$ 3	$ 5	$ 5
Interest cost	[1]	27	29	54	60
Expected return on plan assets	[1]	(35)	(37)	(70)	(76)
Recognized net actuarial loss	[1]	8	7	16	14
Curtailments	[2]			1
Settlements	[2]	(1)	21	(1)	21
Net periodic benefit cost		2	23	5	24
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			1	1	2
Interest cost	[1]	6	7	12	13
Recognized net actuarial loss	[1]	2	1	3	2
Amortization of prior service benefit	[1]	(4)	(4)	(7)	(7)
Net periodic benefit cost		$ 4	$ 5	$ 9	$ 10

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

[2] These amounts were reported in Restructuring and other charges, net on the accompanying Statement of Consolidated Operations and Cash Flows.