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Note 4 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock options | $ 4 | $ 4 | $ 11 | $ 12
Retention awards | 13 | 16 | 54 | 50
Total stock-based compensation, before tax | 21 | 24 | 77 | 66
Excess tax benefits from equity compensation plans | 2 | 1 | 20 | 18
Employee Stock [Member] |  |  |  |
ESPP | $ 4 | $ 4 | $ 12 | $ 4

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