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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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