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Note 4 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock options	$ 4	$ 4	$ 11	$ 12
Retention awards	13	16	54	50
Total stock-based compensation, before tax	21	24	77	66
Excess tax benefits from equity compensation plans	2	1	20	18
Employee Stock [Member]
ESPP	$ 4	$ 4	$ 12	$ 4

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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