Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used Calculate Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Discount rate	3.30%	1.20%	0.80%
Expected returns on plan assets	2.90%	2.60%	2.60%
Rate of compensation increase	2.20%	1.90%	1.60%