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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Name:	us-gaap_AccountsReceivableNetNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Railway Operating Revenues - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Average transit days (or less)	7 days
Revenue, payment terms	15 days
Trade Accounts Receivable
Disaggregation of Revenue [Line Items]
Accounts receivable, net, noncurrent	$ 23	$ 23
Ancillary Services
Disaggregation of Revenue [Line Items]
Accessorial services percent of total railway operating revenues	7.00%	5.00%	5.00%