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Investment in Affiliates and Related-Party Transactions - Schedule of Related Party Consolidated Balance Sheet Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Corporate Joint Venture | Conrail |  |
Related Party Transaction [Line Items] |  |
Accounts payable | $ 154 | $ 136
Corporate Joint Venture | Conrail | 1.31% CSX Promissory Note due December 2050 |  |
Related Party Transaction [Line Items] |  |
Notes payable | $ 73 | $ 73
Promissory note interest rate | 1.31% | 1.31%
Corporate Joint Venture | Conrail | 1.31% CSXT Promissory Note due December 2050 |  |
Related Party Transaction [Line Items] |  |
Notes payable | $ 368 | $ 368
Promissory note interest rate | 1.31% | 1.31%
Related Party | TTX |  |
Related Party Transaction [Line Items] |  |
Accounts payable | $ 43 | $ 38

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