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Note 19 - Related Parties (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Payable, Current	$ 856	$ 784
UPRR [Member] | TTX Company [Member]
Accounts Payable, Current	60	68
UPRR [Member] | TTX Company [Member] | Car Hire Expenses [Member]
Related Party Transaction, Amounts of Transaction	$ 399	402	$ 375
TTX Company [Member] | UPRR [Member]
Equity Method Investment, Ownership Percentage	37.03%
Equity Method Investments	$ 1,800	$ 1,700

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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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