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Investments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) railroad	Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items]
Equity Method Investments	$ 2,662	$ 2,646
Corporate-owned life insurance at net cash surrender value	902	767
Other investments	26	15
Total long-term investments	$ 3,590	3,428
Number of railroads | railroad	8
Conrail Inc.
Schedule of Investments [Line Items]
Equity Method Investments	$ 1,446	1,387
TTX Company
Schedule of Investments [Line Items]
Equity Method Investments	798	749
Other
Schedule of Investments [Line Items]
Equity Method Investments	$ 418	$ 510

X

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Number of Railroads Owning Joint Railcar Pooling Company

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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