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Note 4 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock options | $ 3 | $ 4 | $ 7 | $ 8
Retention awards | 19 | 18 | 41 | 34
Total stock-based compensation, before tax | 26 | 22 | 56 | 42
Excess tax benefits from equity compensation plans | 1 | 2 | 18 | 17
Employee Stock [Member] |  |  |  |
ESPP | $ 4 | $ 0 | $ 8 | $ 0

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