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Related Parties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Equipment and other rents	$ 241	$ 216
Accounts payable, current	898		$ 847
UPRR | Equity Method Investee
Related Party Transaction [Line Items]
Equipment and other rents	112	$ 102
Accounts payable, current	$ 74		70
TTX Company | UPRR
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	37.03%
Equity method investments	$ 1,900		$ 1,900

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Rent paid for freight cars owned by other railroads or private companies, net of rents received, including lease expenses primarily for locomotives, railcars, containers and trailers, office and other rentals.

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