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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | The following table provides a reconciliation between basic and diluted earnings per share:
Millions, Except Per Share Amounts, |  |  |  |
for the Three Months Ended March 31, | 2020 | 2019
Net income | $ | 1,474 | $ | 1,391
Weighted-average number of shares outstanding: |  |  |  |
Basic |  | 684.3 |  | 716.8
Dilutive effect of stock options |  | 0.9 |  | 1.3
Dilutive effect of retention shares and units |  | 1.0 |  | 1.4
Diluted |  | 686.2 |  | 719.5
Earnings per share – basic | $ | 2.15 | $ | 1.94
Earnings per share – diluted | $ | 2.15 | $ | 1.93
Stock options excluded as their inclusion would be anti-dilutive |  | 0.7 |  | 0.4

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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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