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Investments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
railroad
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]      
Number of railroads | railroad 7    
Impairment of investment $ 0 $ 0 $ 99
Loss due to noncash impairment charges against equity method investment     74
Shared Assets Areas CRC Lease      
Schedule of Investments [Line Items]      
Future payments for access fees due 2023 42    
Future payments for access fees due 2024 42    
Future payments for access fees due 2025 42    
Future payments for access fees due 2026 42    
Future payments for access fees due 2027 42    
Future payments for access fees, thereafter $ 62    
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 156 $ 147 129
General and administrative support to Conrail 6    
Accounts payable converted into long-term advances from Conrail     254
Due to Conrail, current 173 112  
Due to Conrail, noncurrent $ 534 534  
Due to affiliate, average interest rate 1.31%    
Equity in earnings of investee $ 58 56 58
TTX Company      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage 19.78%    
Equity in earnings of investee $ 53 53 48
TTX Company | Purchased Services and Rent      
Schedule of Investments [Line Items]      
Expenses from transactions with related party $ 256 $ 246 $ 250