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Note 7 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions, Except Per Share Amounts |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net income |  | $ | 1,569 |  |  | $ | 1,835 |  |  | $ | 3,199 |  |  | $ | 3,465 |
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 608.7 |  |  |  | 625.6 |  |  |  | 609.6 |  |  |  | 628.9 |
Dilutive effect of stock options |  |  | 0.3 |  |  |  | 0.6 |  |  |  | 0.4 |  |  |  | 0.7 |
Dilutive effect of retention shares and units |  |  | 0.5 |  |  |  | 0.6 |  |  |  | 0.5 |  |  |  | 0.6 |
Diluted |  |  | 609.5 |  |  |  | 626.8 |  |  |  | 610.5 |  |  |  | 630.2 |
Earnings per share – basic |  | $ | 2.58 |  |  | $ | 2.93 |  |  | $ | 5.25 |  |  | $ | 5.51 |
Earnings per share – diluted |  | $ | 2.57 |  |  | $ | 2.93 |  |  | $ | 5.24 |  |  | $ | 5.50 |
Stock options excluded as their inclusion would be anti-dilutive |  |  | 1.0 |  |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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