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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2017
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) | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |
Net income | $ | 1,305 |  |  | $ | 726 |  |  | $ | 2,398 |  |  | $ | 1,165 |
Denominator: |  |  |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted-average shares outstanding | 467,981,077 |  |  | 467,701,328 |  |  | 468,244,458 |  |  | 457,102,802 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Share-based compensation plans | 3,872,860 |  |  | 3,455,969 |  |  | 3,900,678 |  |  | 3,379,559 |
Weighted-average shares outstanding and assumed conversions | 471,853,937 |  |  | 471,157,297 |  |  | 472,145,136 |  |  | 460,482,361 |
Basic earnings per share | $ | 2.79 |  |  | $ | 1.55 |  |  | $ | 5.12 |  |  | $ | 2.55 |
Diluted earnings per share | $ | 2.77 |  |  | $ | 1.54 |  |  | $ | 5.08 |  |  | $ | 2.53 |
Potential anti-dilutive share conversions | 2,066,578 |  |  | 2,103,281 |  |  | 1,467,556 |  |  | 2,056,018 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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