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Earnings per share | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share
| Three Months Ended |  |  | Six Months Ended |
| June 30 |  |  | June 30 |
(in millions of U.S. dollars, except share and per share data) | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |
Net income | $ | 1,150 |  |  | $ | 1,294 |  |  | $ | 2,190 |  |  | $ | 2,376 |
Denominator: |  |  |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted-average shares outstanding | 457,224,455 |  |  | 465,276,597 |  |  | 458,010,447 |  |  | 465,488,724 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Share-based compensation plans | 2,945,237 |  |  | 3,103,727 |  |  | 2,863,109 |  |  | 3,489,013 |
Weighted-average shares outstanding and assumed conversions | 460,169,692 |  |  | 468,380,324 |  |  | 460,873,556 |  |  | 468,977,737 |
Basic earnings per share | $ | 2.52 |  |  | $ | 2.78 |  |  | $ | 4.78 |  |  | $ | 5.10 |
Diluted earnings per share | $ | 2.50 |  |  | $ | 2.76 |  |  | $ | 4.75 |  |  | $ | 5.07 |
Potential anti-dilutive share conversions | 2,660,925 |  |  | 3,814,491 |  |  | 5,037,959 |  |  | 3,305,735 |
Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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