Number Of Railroads Owning Joint Railcar Pooling Company

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Amount of receivables owed to an entity that is affiliated with the reporting entity by means of direct or indirect ownership, which are usually due after one year (or one business cycle, if longer).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Investments (Details) $ in Millions	3 Months Ended		12 Months Ended
Investments (Details) $ in Millions	Mar. 31, 2022 USD ($) railroad	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Number of railroads \| railroad	8
Equity Method Investee
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	$ 1,500		$ 1,500
Expenses from transactions with related party	38	$ 34
Equity in the earnings of investee	14	14
Due to affiliate, noncurrent	$ 534		$ 534
Due to affiliate, average interest rate	1.31%		1.31%
TTX Company
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	19.65%
Expenses from transactions with related party	$ 64	63
Equity in the earnings of investee	$ 10	$ 17