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Earnings per share | 12 Months Ended
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Dec. 31, 2018
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) | 2018 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |
Net income | $ | 3,962 |  |  | $ | 3,861 |  |  | $ | 4,135 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted-average shares outstanding | 463,629,203 |  |  | 467,145,716 |  |  | 462,519,789 |
Denominator for diluted earnings per share: |  |  |  |  |
Share-based compensation plans | 3,173,145 |  |  | 4,051,185 |  |  | 3,429,610 |
Weighted-average shares outstanding and assumed conversions | 466,802,348 |  |  | 471,196,901 |  |  | 465,949,399 |
Basic earnings per share | $ | 8.55 |  |  | $ | 8.26 |  |  | $ | 8.94 |
Diluted earnings per share | $ | 8.49 |  |  | $ | 8.19 |  |  | $ | 8.87 |
Potential anti-dilutive share conversions | 3,543,188 |  |  | 1,776,025 |  |  | 1,206,828 |
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://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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