Note 2 - Operations and Segmentation (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Number of Reportable Segments	1
Number of Operating Segments	1
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,056	$ 5,860
MEXICO
Revenue from Contract with Customer, Excluding Assessed Tax	$ 712	$ 654