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Other Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Real estate income | $ 263 | $ 414 | $ 381
Net periodic pension benefit/(costs) | 55 | 52 | 84
Interest income | 52 | 52 | 23
Non-operating property environmental remediation and restoration | (37) | (37) | (47)
Interest from IRS refund claims | 24 | 0 | 0
Other | (7) | 10 | (15)
Total | $ 350 | 491 | 426
Illinois State Toll Highway Authority | Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gain from land sale |  |  | 79
Colorado Department of Transportation | Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gain from land sale |  |  | $ 35
Real Estate Transaction |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Real estate income |  | $ 107 |

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