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Investments (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) railroad	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Number of railroads | railroad			8
Conrail, Economic
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	58.00%		58.00%
Conrail, Voting
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Conrail Inc
Schedule of Investments [Line Items]
Equity method investments	$ 1,600		$ 1,600		$ 1,500
Expenses from transactions with related party	42	$ 37	116	$ 108
Equity in the earnings of investee	15	14	40	42
Due to affiliate, noncurrent	$ 534		$ 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%		19.65%
Expenses from transactions with related party	$ 63	59	$ 193	183
Equity in the earnings of investee	$ 18	$ 12	$ 39	$ 43

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