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Note 16 - Related Parties (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Accounts Payable, Current | $ 894 |  | $ 894 |  | $ 784
UPRR [Member] | TTX Company [Member] |  |  |  |  |
Accounts Payable, Current | $ 68 |  | $ 68 |  | 68
TTX Company [Member] | UPRR [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 37.03% |  | 37.03% |  |
Equity Method Investments | $ 1,800 |  | $ 1,800 |  | $ 1,700
TTX Company [Member] | UPRR [Member] | Car Hire Expenses [Member] |  |  |  |  |
Other Expenses | $ 102 | $ 98 | $ 205 | $ 192 |

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