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Railway Operating Revenues - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue, payment terms			15 days
Contract liabilities	$ 0		$ 0		$ 0
Contract assets	0		0		0
Other Noncurrent Receivables
Disaggregation of Revenue [Line Items]
Accounts receivable, net, noncurrent	$ 23,000,000		$ 23,000,000		$ 23,000,000
Accessorial Services
Disaggregation of Revenue [Line Items]
Accessorial services percent of total railway operating revenues	7.00%	5.00%	6.00%	5.00%

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Ancillary Services Percent Of Total Railway Operating Revenues

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