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Related Parties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Equipment and other rents	$ 212	$ 237	$ 683	$ 672
Accounts payable, current	853		853		$ 847
UPRR | Equity Method Investee
Related Party Transaction [Line Items]
Equipment and other rents	115	$ 112	336	$ 321
Accounts payable, current	$ 75		$ 75		70
UPRR | TTX Company
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	37.03%		37.03%
Equity method investments	$ 2,000		$ 2,000		$ 1,900

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