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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, 2021 | Dec. 31, 2020
Corporate Joint Venture | Conrail | Accounts Payable |  |
Related Party Transaction [Line Items] |  |
Payable to Affiliates | $ 100 | $ 50
Corporate Joint Venture | Conrail | Long-term Debt | 1.31% CSX Promissory Note due December 2050 |  |
Related Party Transaction [Line Items] |  |
Promissory note interest rate | 1.31% | 1.31%
Promissory notes payable to Conrail subsidiary | $ 73 | $ 73
Corporate Joint Venture | Conrail | Long-term Debt | 1.31% CSXT Promissory Note due December 2050 |  |
Related Party Transaction [Line Items] |  |
Promissory note interest rate | 1.31% | 1.31%
Promissory notes payable to Conrail subsidiary | $ 368 | $ 368
Affiliated Entity | TTX | Accounts Payable |  |
Related Party Transaction [Line Items] |  |
Payable to Affiliates | $ 35 | $ 40

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