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Segment Reporting and Significant Expenses- Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]
Number of operating segments | segment			2
Assets	$ 43,279		$ 43,279		$ 42,764
Rail Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Segment, expenditure, addition to long-lived assets	717	$ 610	2,173	$ 1,631
Assets	43,100		43,100		$ 42,600
Rail Operations | Hurricane Helene
Segment Reporting, Asset Reconciling Item [Line Items]
Segment, expenditure, addition to long-lived assets	$ 145		$ 440

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