Pension And Other Retirement Benefits - Summary Of Pre Tax Amounts Recognized In Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss) arising during the period	$ 9	$ 25	$ (8)
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (gains) losses and prior service credit	(1)	(1)	(1)
(Gain) loss on settlement of pension obligations	0	(1)	(2)
Net actuarial gain (loss) arising during the period	8	22	(3)
Total recognized in OCI – pre-tax	7	20	(6)
U.S. Plans | Other Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (gains) losses and prior service credit	(1)	(1)	(1)
(Gain) loss on settlement of pension obligations	0	0	0
Net actuarial gain (loss) arising during the period	1	4	1
Total recognized in OCI – pre-tax	$ 0	$ 3	$ 0