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The assumptions used in the Black-Scholes pricing model are set forth in the following table: (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity:      
Weighted-average expected stock-price volatility 29.00% 26.00% 25.00%
Weighted-average expected option life 4 years 4 years 5 years
Weighted-average risk-free interest rate 3.80% 4.00% 0.40%
Weighted-average dividend yield 2.00% 2.40% 1.60%