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Related Parties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Equipment and other rents | $ 920 | $ 947 | $ 898
Accounts payable, current | 847 | 856 |
UPRR | Equity Method Investee |  |  |
Related Party Transaction [Line Items] |  |  |
Equipment and other rents | 432 | 399 | $ 402
Accounts payable, current | $ 70 | 60 |
TTX Company | UPRR |  |  |
Related Party Transaction [Line Items] |  |  |
Equity method investment, ownership percentage | 37.03% |  |
Equity method investments | $ 1,900 | $ 1,800 |

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