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Investments (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) railroad	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Number of railroads | railroad	7
Purchased services and rents	$ 496	$ 437
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	$ 1,600		$ 1,600
Expenses for operation of the Shared Assets Areas	45	38
Equity in the earnings of investee	16	14
Long-term advances, amount	$ 534		$ 534
Long-term advances, 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	$ 9	10
Purchased services and rents	$ 66	$ 64

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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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