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Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common Shares: |  |  |  |
Shares issued, beginning of year |  | 583,289,850 | 579,000,841 | 574,617,195
Shares issued | [1] | 3,517,399 | 2,669,229 | 2,646,164
Restricted shares issued, net of cancellations |  | 1,443,513 | 1,619,780 | 1,737,482
Shares issued, end of year |  | 588,250,762 | 583,289,850 | 579,000,841
Common shares held in treasury, end of year |  | (217,904,765) | (204,365,956) | (172,280,199)
Common shares outstanding, end of year |  | 370,345,997 | 378,923,894 | 406,720,642
Authorized and Issued: |  |  |  |
Common shares authorized |  | 1,800,000,000 |  |
Common shares, par value per share |  | $ 0.0011 | $ 0.0011 |
Preferred shares authorized |  | 50,000,000 |  |
Preferred shares, par value per share |  | $ 0.01 |  |
[1] | Includes shares issued from the exercise of stock options and stock appreciation rights, the vesting of restricted share units and shares issued from the employee share purchase plan.

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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