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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2025
Earnings Per Share [Abstract]  
Earnings Per Common Share
The calculation of basic earnings per common share is computed by dividing income available to Arch common shareholders by the weighted average number of Common Shares and common share equivalents outstanding. The following table sets forth the computation of basic and diluted earnings per common share:
Year Ended December 31,
202520242023
Numerator:
Net income$4,399 $4,312 $4,442 
Amounts attributable to noncontrolling interests— — 1 
Net income available to Arch4,399 4,312 4,443 
Preferred dividends(40)(40)(40)
Net income available to Arch common shareholders$4,359 $4,272 $4,403 
Denominator:
Weighted average common shares outstanding368.4 372.5 368.7 
Effect of dilutive common share equivalents:
Nonvested restricted shares1.6 2.1 2.5 
Stock options (1)5.9 7.2 7.6 
Weighted average common shares and common share equivalents outstanding – diluted375.9 381.8 378.8 
Earnings per common share:
Basic$11.83 $11.47 $11.94 
Diluted$11.60 $11.19 $11.62 
(1)    Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For 2025, 2024 and 2023, the number of stock options excluded were 2.4 million, 2.2 million and 0.5 million, respectively.