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, 2021	Dec. 31, 2020
Pension Plans
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net actuarial losses	$ (61)	$ (144)
Net prior service credits	3	3
Total recognized in AOCL – pretax	(58)	(141)
Other Retirement Plans
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Net actuarial losses	(4)	(8)
Net prior service credits	0	0
Total recognized in AOCL – pretax	$ (4)	$ (8)