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Investments (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) railroad	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Schedule of Investments [Line Items]
Other liabilities	$ 1,708		$ 1,708		$ 1,760
Number of railroads | railroad			6
Purchased services and rents	$ 520	$ 516	$ 1,018	$ 1,044
Conrail, Economic
Schedule of Investments [Line Items]
Equity method investment, ownership (as a percent)	58.00%		58.00%
Conrail, Voting
Schedule of Investments [Line Items]
Equity method investment, ownership (as a percent)	50.00%		50.00%
Conrail Inc
Schedule of Investments [Line Items]
Equity method investments	$ 1,800		$ 1,800		1,700
Expenses for operation of the Shared Assets Areas	44	50	93	102
Equity in the earnings of investee	23	22	39	43
Other liabilities	$ 534		$ 534		$ 534
Due to affiliate, average interest rate (as a percent)			1.31%		1.31%
TTX Company
Schedule of Investments [Line Items]
Equity method investment, ownership (as a percent)	19.78%		19.78%
Equity in the earnings of investee	$ 9	14	$ 20	27
Purchased services and rents	$ 81	$ 74	$ 155	$ 148

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The amount of expense for contract services provided to the Company and 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.

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