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Earnings per share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share
| Year Ended December 31 |
(in millions of U.S. dollars, except share and per share data) | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |
Net income | $ | 3,861 |  |  | $ | 4,135 |  |  | $ | 2,834 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted-average shares outstanding | 467,145,716 |  |  | 462,519,789 |  |  | 325,589,361 |
Denominator for diluted earnings per share: |  |  |  |  |
Share-based compensation plans | 4,051,185 |  |  | 3,429,610 |  |  | 3,246,017 |
Weighted-average shares outstanding and assumed conversions | 471,196,901 |  |  | 465,949,399 |  |  | 328,835,378 |
Basic earnings per share | $ | 8.26 |  |  | $ | 8.94 |  |  | $ | 8.71 |
Diluted earnings per share | $ | 8.19 |  |  | $ | 8.87 |  |  | $ | 8.62 |
Potential anti-dilutive share conversions | 1,776,025 |  |  | 1,206,828 |  |  | 1,601,668 |
Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective years.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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