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Commitments and Contingencies - Other Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) location railroad | Dec. 31, 2024 USD ($) location
Loss Contingencies [Line Items] |  |
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag | Consolidated Balance Sheets | Consolidated Balance Sheets
Number of locations with one or more subsidiaries in conjunction with other parties identified as potentially responsible parties | location | 8 |
Employees covered by collective bargaining agreements (as a percent) | 80.00% |
Number of labor unions | railroad | 13 |
Other Environmental Claims |  |
Loss Contingencies [Line Items] |  |
Environmental matters liabilities | $ | $ 65 | $ 65
Current environmental liability | $ | $ 15 | $ 15
Number of sites - remediation locations and projects | location | 73 | 74
Number of sites - representative sample | location | 21 |
Liability associated with those sites | $ | $ 56 |
Environmental locations representative sample liability payout period, in years | 5 years |

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