Employee Benefits - Weighted Average Assumptions Used In Determining Net Periodic Cost (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate in effect for determining service cost	3.80%	3.20%	3.30%
Discount rate in effect for determining interest cost	3.20%	1.90%	2.40%
Expected return on plan assets	6.70%	6.50%	6.50%
Rate of compensation increases	3.00%	3.00%	3.00%
Health Care and Life
Defined Benefit Plan Disclosure [Line Items]
Discount rate in effect for determining service cost	3.20%	3.00%	3.50%
Discount rate in effect for determining interest cost	2.30%	1.80%	2.80%
Expected return on plan assets	4.90%	4.20%	4.50%