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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Discount rates:      
Projected benefit obligation 5.56% 2.89% 2.49%
Service cost 5.75% 3.29% 3.14%
Interest cost 5.45% 2.37% 1.83%