Pension and Other Postretirement Benefits - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.30%	5.03%
Rate of compensation increase	3.20%	3.77%
Discount rate	5.02%	5.34%	2.66%
Expected long-term rate of return on plan assets	6.13%	6.21%	4.94%
Rate of compensation increase	3.77%	3.21%	3.11%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.53%	5.19%
Discount rate	5.17%	5.45%	2.46%