Employee Benefit Plans (The Weighted-Average Discount Rate Assumptions Used to Determine Net Periodic Benefit Costs) (Detail) - Unfunded Supplemental Benefit Plans	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Discount rates:
Projected benefit obligation	2.89%	2.49%	3.27%
Service cost	3.29%	3.14%	3.71%
Interest cost	2.37%	1.83%	2.86%