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Investment in Affiliates and Related-Party Transactions - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2014
note
Conrail        
Related Party Transaction [Line Items]        
Payable balance     $ 217  
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 $ 327      
Promissory notes executed | note       2
Interest expense $ 6 $ 6 6  
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  
Note interest rate     2.89%  
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  
Affiliated Entity | TTX        
Related Party Transaction [Line Items]        
Ownership percentage 20.00%