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Note 8 - Earnings Per Share | 12 Months Ended
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Dec. 31, 2021
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 for the years ended December 31, 2021, 2020 and 2019:
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 |
Common stock options totaling 0.2 million, 0.3 million, and 0.5 million for 2021, 2020, and 2019, respectively, were excluded from the computation of diluted earnings per share because the exercise prices of these stock options exceeded the average market price of our common stock for the respective periods, and the effect of their inclusion would be anti-dilutive.

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