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Note 3 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock options	$ 4	$ 4	$ 12	$ 11
Retention awards	24	13	57	54
Total stock-based compensation, before tax	32	21	84	77
Excess income tax benefits from equity compensation plans	2	2	9	20
Employee Stock [Member]
ESPP	$ 4	$ 4	$ 15	$ 12

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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