Pension And Other Retirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - Pension Plans - U.S. Plans - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Aggregate projected benefit obligation	$ 68	$ 65
Aggregate accumulated benefit obligation	$ 60	$ 57