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Investment in Affiliates and Related-Party Transactions - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2014 note
Corporate Joint Venture | Conrail |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage |  | 42.00% |  |  |  |
Voting interest percentage |  | 50.00% |  |  |  |
Difference between carrying amount and underlying equity |  | $ 323 |  |  |  |
Promissory notes executed | note |  |  |  |  |  | 2
Previous notes converted in non-cash transaction | $ 217 |  |  |  |  |
Interest expense |  | $ 6 | $ 6 | $ 6 |  |
Corporate Joint Venture | Conrail | Long-term Debt | 1.31% Promissory Note Due December 2050 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Note interest rate |  |  |  |  | 1.31% |
New notes issued in non-cash transaction |  |  |  |  | $ 441 |
Corporate Joint Venture | Conrail | Long-term Debt | 2.89% Promissory Note Due October 2044 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Previous notes converted in non-cash transaction | $ 224 |  |  |  |  |
Converted instrument, rate | 2.89% |  |  |  |  |
Related Party | TTX |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage |  | 20.00% |  |  |  |

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