Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 3	$ 4	$ 5	$ 7
Interest cost	[1]	29	27	60	54
Expected return on plan assets	[1]	(37)	(44)	(76)	(88)
Recognized net actuarial loss	[1]	7	27	14	55
Settlements	[2]	21		21
Net periodic benefit cost		23	14	24	28
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	2	2
Interest cost	[1]	7	4	13	8
Recognized net actuarial loss	[1]	1	5	2	9
Amortization of prior service cost	[1]	(4)	(4)	(7)	(7)
Net periodic benefit cost		$ 5	$ 6	$ 10	$ 12

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

[2] These amounts were reported in Restructuring and other charges, net on the accompanying Statements of Consolidated Operations (see Note D) and Cash Flows.