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Earnings per share | 12 Months Ended
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Dec. 31, 2020
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) | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |
Net income | $ | 3,533 |  |  | $ | 4,454 |  |  | $ | 3,962 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted-average shares outstanding | 451,602,820 |  |  | 455,910,463 |  |  | 463,629,203 |
Denominator for diluted earnings per share: |  |  |  |  |
Share-based compensation plans | 1,838,692 |  |  | 3,004,200 |  |  | 3,173,145 |
Weighted-average shares outstanding and assumed conversions | 453,441,512 |  |  | 458,914,663 |  |  | 466,802,348 |
Basic earnings per share | $ | 7.82 |  |  | $ | 9.77 |  |  | $ | 8.55 |
Diluted earnings per share | $ | 7.79 |  |  | $ | 9.71 |  |  | $ | 8.49 |
Potential anti-dilutive share conversions | 6,811,966 |  |  | 2,410,337 |  |  | 3,543,188 |
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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