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Note 3 - Operations and Segmentation (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Number of Reportable Segments			1
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,269	$ 5,504	$ 12,129	$ 10,505
MEXICO
Revenue from Contract with Customer, Excluding Assessed Tax	$ 681	$ 618	$ 1,300	$ 1,200

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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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.

+ References

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