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Note 4 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Stock options | $ 5 | $ 4 | $ 9 | $ 8
Retention awards | 18 | 15 | 35 | 33
Total stock-based compensation, before tax | 28 | 24 | 54 | 52
Excess income tax benefits from equity compensation plans | 1 | 1 | 10 | 7
Employee Stock [Member] |  |  |  |
ESPP | $ 5 | $ 5 | $ 10 | $ 11

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