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Related Parties (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |
Equipment and other rents | $ 241 | $ 216 |
Accounts payable, current | 898 |  | $ 847
UPRR | Equity Method Investee |  |  |
Related Party Transaction [Line Items] |  |  |
Equipment and other rents | 112 | $ 102 |
Accounts payable, current | $ 74 |  | 70
TTX Company | UPRR |  |  |
Related Party Transaction [Line Items] |  |  |
Equity method investment, ownership percentage | 37.03% |  |
Equity method investments | $ 1,900 |  | $ 1,900

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