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Investments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) railroad	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Investments [Line Items]
Other liabilities	$ 1,767		$ 1,839
Number of railroads | railroad	6
Purchased services and rents	$ 528	$ 496
Conrail, Economic
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	58.00%
Conrail, Voting
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Conrail Inc
Schedule of Investments [Line Items]
Equity method investments	$ 1,700		1,700
Expenses for operation of the Shared Assets Areas	52	45
Equity in the earnings of investee	21	$ 16
Other liabilities	$ 534		$ 534
Due to affiliate, average interest rate	1.31%	1.31%
TTX Company
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	19.78%
Equity in the earnings of investee	$ 13	$ 9
Purchased services and rents	$ 74	$ 66

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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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