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	6 Months Ended
	Jun. 30, 2023 USD ($) Employees	Jun. 30, 2023 USD ($) Employees	Jun. 30, 2022 USD ($)	Apr. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Decrease to other noncurrent assets		$ 66,000,000	$ 71,000,000
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