Note 7 - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 178	$ 131	$ 62
Additions based on tax positions related to the current year	10	54	19
Additions for tax positions of prior years	24	17	53
Reductions for tax positions of prior years	(5)	(21)
Settlements and lapse of statute of limitations	(1)	(3)	(3)
Balance	$ 206	$ 178	$ 131