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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share, Basic And Diluted |
| Three Months Ended |  |  | Nine Months Ended |
| September 30 |  |  | September 30 |
(in millions of U.S. dollars, except share and per share data) | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | (70 | ) |  | $ | 1,360 |  |  | $ | 2,328 |  |  | $ | 2,525 |
Denominator: |  |  |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted-average shares outstanding | 466,370,784 |  |  | 468,021,093 |  |  | 467,658,334 |  |  | 460,631,794 |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Share-based compensation plans | — |  |  | 3,375,269 |  |  | 3,961,572 |  |  | 3,439,017 |
Weighted-average shares outstanding and assumed conversions | 466,370,784 |  |  | 471,396,362 |  |  | 471,619,906 |  |  | 464,070,811 |
Basic earnings (loss) per share | $ | (0.15 | ) |  | $ | 2.90 |  |  | $ | 4.98 |  |  | $ | 5.48 |
Diluted earnings (loss) per share | $ | (0.15 | ) |  | $ | 2.88 |  |  | $ | 4.94 |  |  | $ | 5.44 |
Potential anti-dilutive share conversions | 2,045,829 |  |  | 1,306,710 |  |  | 1,673,777 |  |  | 1,635,337 |

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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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