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Note 8 - Earnings Per Share | 6 Months Ended
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Jun. 30, 2024
Notes to Financial Statements |
Earnings Per Share [Text Block] | 8. Earnings Per Share The following table provides a reconciliation between basic and diluted earnings per share:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions, Except Per Share Amounts |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Net income |  | $ | 1,673 |  |  | $ | 1,569 |  |  | $ | 3,314 |  |  | $ | 3,199 |
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 609.4 |  |  |  | 608.7 |  |  |  | 609.3 |  |  |  | 609.6 |
Dilutive effect of stock options |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.5 |  |  |  | 0.4 |
Dilutive effect of retention shares and units |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Diluted |  |  | 610.3 |  |  |  | 609.5 |  |  |  | 610.3 |  |  |  | 610.5 |
Earnings per share - basic |  | $ | 2.75 |  |  | $ | 2.58 |  |  | $ | 5.44 |  |  | $ | 5.25 |
Earnings per share - diluted |  | $ | 2.74 |  |  | $ | 2.57 |  |  | $ | 5.43 |  |  | $ | 5.24 |
Stock options excluded as their inclusion would be anti-dilutive |  |  | 0.5 |  |  |  | 1.0 |  |  |  | 0.5 |  |  |  | 0.9 |

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