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Investment in Affiliates and Related-Party Transactions - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2014
note
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   $ 323        
Promissory notes executed | note           2
Previous notes converted in non-cash transaction $ 217          
Interest expense   $ 6 $ 6 $ 6    
Corporate Joint Venture | Conrail | Long-term Debt | 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  
Corporate Joint Venture | Conrail | Long-term Debt | 2.89% Promissory Note Due October 2044            
Related Party Transaction [Line Items]            
Previous notes converted in non-cash transaction $ 224          
Converted instrument, rate 2.89%          
Related Party | TTX            
Related Party Transaction [Line Items]            
Ownership percentage   20.00%