Note 4 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Provision for income taxes (Note 4)	$ (3)	$ (35)	$ (124)	$ (178)
Effective tax rate	(3.30%)	16.10%	33.00%	20.80%