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Investment in Affiliates and Related-Party Transactions - Equity-method Investments in Affiliates (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Related Party Transaction [Line Items] |  |
Total | $ 2,397 | $ 2,292
Corporate Joint Venture | Conrail |  |
Related Party Transaction [Line Items] |  |
Total | 1,175 | 1,124
Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Total | 2,397 | 2,292
Affiliated Entity | TTX |  |
Related Party Transaction [Line Items] |  |
Total | 961 | 914
Affiliated Entity | Oher Equity Method and Cost Method Investments |  |
Related Party Transaction [Line Items] |  |
Total | $ 261 | $ 254

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