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Note 8 - Stock-based Compensation - Stock-based Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock-based compensation expense, gross | $ 7 | $ 6 | $ 9 | $ 11
Income tax benefit at our statutory rate associated with stock-based compensation | (2) | (2) | (2) | (3)
Stock-based compensation expense, net | $ 5 | $ 4 | $ 7 | $ 8

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