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Note 4 - Stock Options and Other Stock Plans - Stock-based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock options | $ 15 | $ 15 | $ 16
Retention awards | 66 | 58 | 77
Total stock-based compensation, before tax | 88 | 73 | 93
Excess tax benefits from equity compensation plans | 26 | 55 | 52
Employee Stock [Member] |  |  |
ESPP | $ 7 | $ 0 | $ 0

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