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Investments - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) railroad	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items]
Access fees due 2022	$ 42
Access fees due 2023	$ 43
Number of railroads | railroad	8
Impairment of investment	$ 0	$ 99	$ 0
Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Investments [Line Items]
Impairment of investment		99
Loss due to noncash impairment charges against equity method investment		$ 74
Shared Assets Areas CRC Lease
Schedule of Investments [Line Items]
Access fees due 2024	$ 18
Conrail Equity
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
Schedule of Investments [Line Items]
Difference between investment and share of underlying net equity	$ 487
Expenses from transactions with related party	147	$ 129	149
General and administrative support to Conrail	6
Accounts payable into long-term advances from Conrail		254
Due to Conrail, current	112	56
Due to Conrail, noncurrent	$ 534	534
Due to affiliate, average interest rate	1.31%
Equity in earnings of investee	$ 56	58	53
TTX Company
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	19.65%
Equity in earnings of investee	$ 53	48	58
TTX Company | Purchased Services and Rent
Schedule of Investments [Line Items]
Expenses from transactions with related party	$ 246	$ 250	$ 244

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