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Note 8 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net income |  | $ | 1,835 |  |  | $ | 1,798 |  |  | $ | 3,465 |  |  | $ | 3,139 |
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 625.6 |  |  |  | 658.5 |  |  |  | 628.9 |  |  |  | 663.1 |
Dilutive effect of stock options |  |  | 0.6 |  |  |  | 0.8 |  |  |  | 0.7 |  |  |  | 0.8 |
Dilutive effect of retention shares and units |  |  | 0.6 |  |  |  | 0.8 |  |  |  | 0.6 |  |  |  | 0.8 |
Diluted |  |  | 626.8 |  |  |  | 660.1 |  |  |  | 630.2 |  |  |  | 664.7 |
Earnings per share – basic |  | $ | 2.93 |  |  | $ | 2.73 |  |  | $ | 5.51 |  |  | $ | 4.73 |
Earnings per share – diluted |  | $ | 2.93 |  |  | $ | 2.72 |  |  | $ | 5.50 |  |  | $ | 4.72 |
Stock options excluded as their inclusion would be anti-dilutive |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.3 |

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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