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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | The following table provides a reconciliation between basic and diluted earnings per share:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
Millions, Except Per Share Amounts | 2021 | 2020 |  | 2021 | 2020
Net income | $ | 1,798 | $ | 1,132 |  | $ | 3,139 | $ | 2,606
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |
Basic |  | 658.5 |  | 677.7 |  |  | 663.1 |  | 681.0
Dilutive effect of stock options |  | 0.8 |  | 0.7 |  |  | 0.8 |  | 0.8
Dilutive effect of retention shares and units |  | 0.8 |  | 0.8 |  |  | 0.8 |  | 0.9
Diluted |  | 660.1 |  | 679.2 |  |  | 664.7 |  | 682.7
Earnings per share – basic | $ | 2.73 | $ | 1.67 |  | $ | 4.73 | $ | 3.83
Earnings per share – diluted | $ | 2.72 | $ | 1.67 |  | $ | 4.72 | $ | 3.82
Stock options excluded as their inclusion would be anti-dilutive |  | 0.4 |  | 1.0 |  |  | 0.3 |  | 0.8

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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