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) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) Employees	Sep. 30, 2023 USD ($)	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) to other noncurrent assets			$ 4	$ 179
Action# 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees			110
Increase (decrease) to other noncurrent assets	$ (1)		$ (1)
Curtailments	$ 1		$ 1
Action #2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees			10
Weighted average discount rate			5.23%		4.81%
Plan remeasurement date			Jun. 30, 2024
Increase (decrease) to other noncurrent assets		$ 19	$ 19
Settlement gain		$ 1	$ (1)
2024 Plan Actions [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of affected plan participants | Employees			120
Increase (decrease) to other noncurrent assets			$ 18
Curtailments			1
Settlement gain			$ (1)