Note 1 - Description of Business and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Beginning balance	$ 16	$ 16
Provision for credit losses	21	1	$ 4
Amounts written off	(20)	(1)
Ending balance	$ 17	$ 16	$ 16