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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-based compensation expense, gross | $ 5 | $ 5 | $ 12 | $ 10
Forfeitures | 0 | 0 | 0 | 0
Income tax benefit at our statutory rate associated with share-based compensation | (1) | (1) | (3) | (3)
Stock-based compensation expense, net | $ 4 | $ 4 | $ 9 | $ 7

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