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Nature of Operations - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment mi	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Network route miles | mi	32,880
Route miles owned | mi	26,291
Number of reportable segments | segment	1
Number of operating segments | segment	1
Total operating revenues | $	$ 24,250	$ 24,119	$ 24,875
Mexico
Segment Reporting Information [Line Items]
Total operating revenues | $	$ 3,000	$ 2,800	$ 2,700

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 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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