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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2025
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted earnings per common share | The following table sets forth the computation of basic and diluted earnings per common share:
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
Numerator: |  |  |  |  |
Net income | $ | 4,399 |  |  | $ | 4,312 |  |  | $ | 4,442 |
Amounts attributable to noncontrolling interests | — |  |  | — |  |  | 1 |
Net income available to Arch | 4,399 |  |  | 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 outstanding | 368.4 |  |  | 372.5 |  |  | 368.7 |
Effect of dilutive common share equivalents: |  |  |  |  |
Nonvested restricted shares | 1.6 |  |  | 2.1 |  |  | 2.5 |
Stock options (1) | 5.9 |  |  | 7.2 |  |  | 7.6 |
Weighted average common shares and common share equivalents outstanding – diluted | 375.9 |  |  | 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.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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