Railway Operating Revenues - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue, payment terms	15 days
Contract assets	$ 0		$ 0
Contract liabilities	0		0
Other Noncurrent Receivables
Disaggregation of Revenue [Line Items]
Accounts receivable, net, noncurrent	$ 0		$ 23,000,000
Accessorial Services
Disaggregation of Revenue [Line Items]
Accessorial services percent of total railway operating revenues	7.00%	6.00%

Ancillary Services Percent Of Total Railway Operating Revenues

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Revenue, Payment Terms

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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