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Shareholders' equity (Rollforward Of Changes In Common Stock Shares Issued And Outstanding) (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Shares issued, Beginning of year | 479,783,864 | 479,783,864 | 479,783,864 |
Treasury Stock, Shares, Retired | (2,178,600) | 0 | 0 |
Shares issued, End of year | 477,605,264 | 479,783,864 | 479,783,864 |
Common Shares in treasury, end of year | (26,872,639) | (27,812,297) | (20,580,486) | (15,950,685)
Stock Issued During Period, Shares, New Issues | 2,345,208 | 3,210,427 | 3,089,234 |
Treasury Stock, Shares, Acquired | (3,584,150) | (10,442,238) | (7,719,035) |
Shares issued and outstanding, end of year | 450,732,625 | 451,971,567 | 459,203,378 |

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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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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