Pension And Other Retirement Benefits - Summary of Changes in Benefit Obligations and Fair Value of Plan Assets for Post-Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in benefit obligation:
Interest cost	$ (30)	$ (26)	$ (26)
Amounts recorded on the consolidated balance sheets:
Pension and retirement benefits asset – non current	74	60
Pension and retirement benefits liability – current	(9)	(11)
Pension and retirement benefits liability – non current	(216)	(195)
Pension Plans
Change in plan assets:
Fair value of plan assets, beginning of the period	460	449
Actual return on plan assets	55	24
Benefits paid	(21)	(24)
Employer contributions	6	11
Plan participants’ contributions	0	0
Fair value of plan assets, end of the period	500	460	449
Funded status of the plans	8	(4)
Other Retirement Plans
Change in plan assets:
Fair value of plan assets, beginning of the period	0	0
Actual return on plan assets	0	0
Benefits paid	(3)	(3)
Employer contributions	1	1
Plan participants’ contributions	2	2
Fair value of plan assets, end of the period	0	0	0
Funded status of the plans	(44)	(42)
U.S. | Pension Plans
Change in benefit obligation:
Benefit obligation, beginning of the period	(464)	(484)
Service cost	(10)	(10)	(11)
Interest cost	(25)	(22)	(22)
Plan participants’ contributions	0	0
Benefits paid	21	24
Actuarial (loss) gain	(3)	0
Assumption changes	(11)	28
Benefit obligation, end of the period	(492)	(464)	(484)
Change in plan assets:
Fair value of plan assets, end of the period	500
Amounts recorded on the consolidated balance sheets:
Pension and retirement benefits asset – non current	75	60
Pension and retirement benefits liability – current	(7)	(8)
Pension and retirement benefits liability – non current	(60)	(56)
Net amount recognized	8	(4)
Accumulated benefit obligation, end of the period	(464)	(436)
U.S. | Other Retirement Plans
Change in benefit obligation:
Benefit obligation, beginning of the period	(42)	(42)
Service cost	(3)	(3)	(3)
Interest cost	(2)	(2)	(2)
Plan participants’ contributions	(2)	(2)
Benefits paid	4	3
Actuarial (loss) gain	2	0
Assumption changes	(1)	4
Benefit obligation, end of the period	(44)	(42)	$ (42)
Amounts recorded on the consolidated balance sheets:
Pension and retirement benefits asset – non current	0	0
Pension and retirement benefits liability – current	(2)	(2)
Pension and retirement benefits liability – non current	(42)	(40)
Net amount recognized	$ (44)	$ (42)