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Note 1 - Nature of Operations (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Network Route Miles	32,693
Route Miles Owned	26,110
Number of Reportable Segments	1
Number of Operating Segments	1
Revenue from Contract with Customer, Excluding Assessed Tax	$ 24,119	$ 24,875	$ 21,804
MEXICO
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,800	$ 2,700	$ 2,400

X

- Definition

The approximate number of route miles linking Pacific Coast and Gulf Coast ports with the Midwest and Eastern U.S. gateways and providing several corridors to key Mexican and Canadian gateways.

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Number of route miles owned by the Company.

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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

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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.

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