Commitments and Contingencies - Schedule of Number of Locomotives and Payments under Long-term Maintenance Program (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Amounts Paid	$ 311	$ 236	$ 235
Locomotive Maintenance & Rebuild Payments
Other Commitments [Line Items]
Amounts Paid		$ 36	$ 67

Cost of maintenance incurred and directly related to good produced and service rendered.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Name:	us-gaap_CostMaintenance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration