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Investments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
railroad
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]      
Future payments for access fees due 2024 $ 44    
Future payments for access fees due 2025 44    
Future payments for access fees due 2026 44    
Future payments for access fees due 2027 44    
Future payments for access fees due 2028 44    
Future payments for access fees, thereafter 17    
Long-term advances from investee $ 1,839 $ 1,759  
Number of railroads | railroad 6    
Purchased services and rents $ 2,070 $ 1,922 $ 1,726
Conrail, Economic      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 58.00% 58.00%  
Conrail, Voting      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 50.00% 50.00%  
Conrail      
Schedule of Investments [Line Items]      
Difference between investment and share of underlying net equity $ 480    
Expenses from transactions with related party 164 $ 156 147
General and administrative support to Conrail, annual fees 6    
Due to Conrail for the operation of Shared Assets Areas 198 173  
Long-term advances from investee $ 534 534  
Long-term advances from investee, average interest rate 1.31%    
Equity in earnings of investee $ 70 58 56
TTX      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 19.78%    
Equity in earnings of investee $ 47 53 53
Purchased services and rents $ 274 $ 256 $ 246