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v3.25.3

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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