Pension And Other Retirement Benefits - Components of Net Periodic Benefit Expense Related to Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 30	$ 26	$ 26
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	10	11
Interest cost	25	22	22
Expected return on plan assets	(33)	(30)	(32)
Amortization of net actuarial (gains) losses and prior service credits from earlier periods	(1)	0	(1)
Loss on settlement of pension obligation	0	(1)	(2)
Net periodic expense (income)	1	1	(2)
U.S. Plans | Other Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Interest cost	2	2	2
Expected return on plan assets	0	0	0
Amortization of net actuarial (gains) losses and prior service credits from earlier periods	(1)	(1)	(1)
Loss on settlement of pension obligation	0	0	0
Net periodic expense (income)	$ 4	$ 4	$ 4