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Note 8 - Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Millions, Except Per Share Amounts |  | 2021 |  |  | 2020 |  |  | 2019 |
Net income |  | $ | 6,523 |  |  | $ | 5,349 |  |  | $ | 5,919 |
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 653.8 |  |  |  | 677.3 |  |  |  | 703.5 |
Dilutive effect of stock options |  |  | 0.8 |  |  |  | 0.8 |  |  |  | 1.2 |
Dilutive effect of retention shares and units |  |  | 0.8 |  |  |  | 1.0 |  |  |  | 1.4 |
Diluted |  |  | 655.4 |  |  |  | 679.1 |  |  |  | 706.1 |
Earnings per share – basic |  | $ | 9.98 |  |  | $ | 7.90 |  |  | $ | 8.41 |
Earnings per share – diluted |  | $ | 9.95 |  |  | $ | 7.88 |  |  | $ | 8.38 |

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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=124432515&loc=d3e3550-109257 + Details
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