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Railway Operating Revenues - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue, payment terms	15 days
Contract liabilities	$ 0		$ 0
Contract assets	0		0
Other Noncurrent Receivables
Disaggregation of Revenue [Line Items]
Accounts receivable, net, noncurrent	$ 23,000,000		$ 23,000,000
Accessorial Services
Disaggregation of Revenue [Line Items]
Accessorial services percent of total railway operating revenues	6.00%	5.00%

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