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Related Parties and Affiliates - Schedule of Related Party Consolidated Balance Sheet Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |
Payable to Affiliates | $ 0 | $ 0
Corporate Joint Venture | Conrail | Accounts Payable |  |
Related Party Transaction [Line Items] |  |
Payable to Affiliates | 213 | 153
Corporate Joint Venture | Conrail | Long-term Debt | 2.89% CSX promissory note due October 2044 |  |
Related Party Transaction [Line Items] |  |
Promissory notes payable to Conrail subsidiary | $ 73 | $ 73
Related party note, interest rate (as a percent) | 2.89% | 2.89%
Corporate Joint Venture | Conrail | Long-term Debt | 2.89% CSXT promissory note due October 2044 |  |
Related Party Transaction [Line Items] |  |
Promissory notes payable to Conrail subsidiary | $ 151 | $ 151
Related party note, interest rate (as a percent) | 2.89% | 2.89%
Affiliated Entity | TTX | Accounts Payable |  |
Related Party Transaction [Line Items] |  |
Payable to Affiliates | $ 34 | $ 36

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