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Note 4 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Stock options | $ 4 | $ 4 | $ 13 | $ 12
Retention awards | 23 | 24 | 58 | 57
Total stock-based compensation, before tax | 33 | 32 | 87 | 84
Excess income tax benefits from equity compensation plans | 3 | 2 | 13 | 9
Employee Stock [Member] |  |  |  |
ESPP | $ 6 | $ 4 | $ 16 | $ 15

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