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Note 7 - Earnings Per Share | 9 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Earnings Per Share [Text Block] | 7. Earnings Per Share The following table provides a reconciliation between basic and diluted earnings per share:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
Millions, Except Per Share Amounts |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net income |  | $ | 1,528 |  |  | $ | 1,895 |  |  | $ | 4,727 |  |  | $ | 5,360 |
Weighted-average number of shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 608.7 |  |  |  | 620.4 |  |  |  | 609.3 |  |  |  | 626.1 |
Dilutive effect of stock options |  |  | 0.4 |  |  |  | 0.5 |  |  |  | 0.4 |  |  |  | 0.7 |
Dilutive effect of retention shares and units |  |  | 0.7 |  |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.6 |
Diluted |  |  | 609.8 |  |  |  | 621.5 |  |  |  | 610.3 |  |  |  | 627.4 |
Earnings per share – basic |  | $ | 2.51 |  |  | $ | 3.05 |  |  | $ | 7.76 |  |  | $ | 8.56 |
Earnings per share – diluted |  | $ | 2.51 |  |  | $ | 3.05 |  |  | $ | 7.75 |  |  | $ | 8.54 |
Stock options excluded as their inclusion would be anti-dilutive |  |  | 1.0 |  |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 0.3 |

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