Pension Benefits - Schedule of Components of Net Periodic Benefit Cost (Detail) - Pension - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 8
Interest cost	14	13
Expected return on assets	(20)	(18)
Amortization of prior service cost	2	1
Net periodic benefit cost	$ 5	$ 4