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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share, Basic And Diluted |
| Year Ended December 31 |
(in millions of U.S. dollars, except share and per share data) | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |
Net income | $ | 4,454 |  |  | $ | 3,962 |  |  | $ | 3,861 |
Denominator: |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |
Weighted-average shares outstanding | 455,910,463 |  |  | 463,629,203 |  |  | 467,145,716 |
Denominator for diluted earnings per share: |  |  |  |  |
Share-based compensation plans | 3,004,200 |  |  | 3,173,145 |  |  | 4,051,185 |
Weighted-average shares outstanding and assumed conversions | 458,914,663 |  |  | 466,802,348 |  |  | 471,196,901 |
Basic earnings per share | $ | 9.77 |  |  | $ | 8.55 |  |  | $ | 8.26 |
Diluted earnings per share | $ | 9.71 |  |  | $ | 8.49 |  |  | $ | 8.19 |
Potential anti-dilutive share conversions | 2,410,337 |  |  | 3,543,188 |  |  | 1,776,025 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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