Retirement Plans - Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Service cost	$ 13	$ 14
Interest cost	16	14
Expected return on plan assets	(53)	(50)
Amortization of unrecognized net actuarial losses	3	15
Settlement loss	0	1
Pension (income) expense	(21)	(6)
Net non-service pension (income) costs included in other, net	$ (34)	$ (20)