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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation Between Earnings Per Share | The following table provides a reconciliation between basic and diluted earnings per share for the years ended December 31:
Millions, Except Per Share Amounts | 2020 | 2019 | 2018
Net income | $ | 5,349 | $ | 5,919 | $ | 5,966
Weighted-average number of shares outstanding: |  |  |  |  |  |
Basic |  | 677.3 |  | 703.5 |  | 750.9
Dilutive effect of stock options |  | 0.8 |  | 1.2 |  | 1.9
Dilutive effect of retention shares and units |  | 1.0 |  | 1.4 |  | 1.5
Diluted |  | 679.1 |  | 706.1 |  | 754.3
Earnings per share – basic | $ | 7.90 | $ | 8.41 | $ | 7.95
Earnings per share – diluted | $ | 7.88 | $ | 8.38 | $ | 7.91

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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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