Note 4 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Provision for income taxes (Note 4)	$ (34)	$ (109)	$ (380)	$ (402)
Effective tax rate	13.10%	22.10%	21.20%	21.80%