Note 1 - Description of Business and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Beginning balance	$ 10	$ 11
Allowance obtained through acquisition	3	0
Provision for credit losses	4	2	$ 11
Amounts written off	(1)	(3)
Ending balance	$ 16	$ 10	$ 11