Pension and Other Postretirement Benefits - Summary of Information in Curtailment or Settlement of Benefits Requiring Remeasurement, Update to Discount Rates Used to Determine Benefit Obligations of Affected Plans (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) Employees	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($) Employees	Sep. 30, 2022 USD ($)	Apr. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Decrease to other noncurrent assets			$ 179,000,000	$ 94,000,000
Action# 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees	370		370
Weighted average discount rate						5.20%	5.58%
Plan remeasurement date			Mar. 31, 2023
Increase to accrued pension benefits liability		$ 15,000,000	$ 15
Decrease to accrued otherpostretirement benefits liability		(9,000,000)	$ (9)
Action# 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees	530		530
Weighted average discount rate					4.80%		5.20%
Plan remeasurement date			Apr. 30, 2023
Increase to accrued pension benefits liability		22,000,000	$ 22
Decrease to other noncurrent assets		(5,000,000)	(5)
Settlements loss		$ 21,000,000	$ 21
Action# 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees	50		50
Weighted average discount rate	5.03%		5.03%				5.08%
Plan remeasurement date			Sep. 30, 2023
Decrease to other noncurrent assets	$ (2,000,000)		$ (2)