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Note 3 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock options | $ 4 | $ 3 | $ 8 | $ 7
Retention awards | 15 | 19 | 33 | 41
Total stock-based compensation, before tax | 24 | 26 | 52 | 56
Excess income tax benefits from equity compensation plans | 1 | 1 | 7 | 18
Employee Stock [Member] |  |  |  |
ESPP | $ 5 | $ 4 | $ 11 | $ 8

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