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Investment in Affiliates and Related-Party Transactions - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
note
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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 $ 319    
Promissory notes executed | note 2    
Interest expense, debt $ 6 $ 6 $ 6
Corporate Joint Venture | Conrail | 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    
Related Party | TTX      
Related Party Transaction [Line Items]      
Ownership percentage 20.00%