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Investments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
railroad
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]      
Borrowings against COLI policies $ 605 $ 0  
Future payments for access fees due 2025 47    
Future payments for access fees due 2026 47    
Future payments for access fees due 2027 47    
Future payments for access fees due 2028 47    
Future payments for access fees, thereafter 21    
Long-term advances from investee $ 1,760 1,839  
Number of railroads | railroad 6    
Purchased services and rents $ 2,048 2,070 $ 1,922
Conrail, Economic      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 58.00%    
Conrail, Voting      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Conrail      
Schedule of Investments [Line Items]      
Difference between investment and share of underlying net equity $ 469    
Expenses from transactions with related party 198 164 156
General and administrative support to conrail, annual fees 7    
Due to conrail for the operation of shared assets areas 243 198  
Long-term advances from investee $ 534 534  
Long-term advances from investee, average interest rate 1.31%    
Equity in earnings of investee $ 89 70 58
TTX      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 19.78%    
Equity in earnings of investee $ 48 47 53
Purchased services and rents $ 295 $ 274 $ 256