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Note 16 - Related Parties (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounts Payable, Current	$ 936		$ 936		$ 784
UPRR [Member] | TTX Company [Member]
Accounts Payable, Current	$ 67		$ 67		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	$ 101	$ 106	$ 306	$ 298

X

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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