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Note 2 - Operations and Segmentation (Details Textual)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Number of Reportable Segments     1  
Number of Operating Segments       1
Revenue from Contract with Customer, Excluding Assessed Tax $ 5,941 $ 6,566 $ 17,960 $ 18,695
MEXICO        
Revenue from Contract with Customer, Excluding Assessed Tax $ 673 $ 708 $ 2,100 $ 2,000