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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share, Basic And Diluted |
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
(in millions of U.S. dollars, except share and per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 2,265 |  |  | $ | (331) |  |  | $ | 4,565 |  |  | $ | (79) |
Denominator: |  |  |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted-average shares outstanding | 445,094,678 |  |  | 451,402,807 |  |  | 447,802,079 |  |  | 451,635,733 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Share-based compensation plans (1) | 2,857,242 |  |  | — |  |  | 2,900,440 |  |  | — |
Weighted-average shares outstanding and assumed conversions | 447,951,920 |  |  | 451,402,807 |  |  | 450,702,519 |  |  | 451,635,733 |
Basic earnings (loss) per share | $ | 5.09 |  |  | $ | (0.73) |  |  | $ | 10.20 |  |  | $ | (0.17) |
Diluted earnings (loss) per share | $ | 5.06 |  |  | $ | (0.73) |  |  | $ | 10.13 |  |  | $ | (0.17) |
Potential anti-dilutive share conversions | 1,777,555 |  |  | 8,378,447 |  |  | 1,879,882 |  |  | 6,583,319 |
(1)For the three and six months ended June 30, 2020, weighted-average shares outstanding used in calculating diluted loss per share excludes the effect of dilutive securities of 1,395,951 and 2,044,144 shares, respectively. In periods where a net loss is recognized, inclusion of incremental dilution is anti-dilutive.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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