Retirement Plans - Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Service cost	$ 12	$ 10
Interest cost	25	23
Expected return on plan assets	(38)	(38)
Amortization of unrecognized net actuarial losses	2	0
Net periodic benefit cost (income)	1	(5)
Net periodic benefit cost (income), excluding service cost, included in Other, net	$ (11)	$ (15)