Pension And Other Retirement Benefits - Summary of Pre-Tax Net Actuarial Losses and Prior Service Cost Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) - U.S. Plans - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Pension Plans
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net actuarial gains (losses)	$ (53)	$ (61)
Net prior service credits	0	1
Total recognized in AOCL – pre-tax	(53)	(60)
Other Retirement Plans
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net actuarial gains (losses)	13	13
Net prior service credits	0	0
Total recognized in AOCL – pre-tax	$ 13	$ 13