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Note 3 - Operations and Segmentation (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Number of Reportable Segments			1
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,007	$ 5,963	$ 12,038	$ 12,019
MEXICO
Revenue from Contract with Customer, Excluding Assessed Tax	$ 744	$ 689	$ 1,500	$ 1,400

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