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Railway Operating Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue, payment terms	15 days
Contract assets	$ 0		$ 0
Contract liabilities	$ 0		$ 0
Accessorial Services
Disaggregation of Revenue [Line Items]
Accessorial services percent of total railway operating revenues	6.00%	7.00%

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Ancillary Services Percent Of Total Railway Operating Revenues

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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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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-Publisher FASB
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