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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, 2022
Dec. 31, 2021
Corporate Joint Venture | Conrail | Accounts Payable    
Related Party Transaction [Line Items]    
CSX Accounts Payable to Conrail $ 136 $ 100
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]    
CSX Accounts Payable to Conrail $ 38 $ 35