Note 3 - Operations and Segmentation (Details Textual) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Number of Reportable Segments			1
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,091	$ 5,941	$ 18,129	$ 17,960
MEXICO
Revenue from Contract with Customer, Excluding Assessed Tax	$ 724	$ 673	$ 2,300	$ 2,100

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details