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Investments (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
railroad
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]          
Other liabilities $ 1,814   $ 1,814   $ 1,759
Number of railroads | railroad     6    
Purchased services and rents $ 506 $ 481 $ 1,002 $ 918  
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 Inc          
Schedule of Investments [Line Items]          
Equity method investments $ 1,600   $ 1,600   $ 1,600
Expenses for operation of the Shared Assets Areas 39 36 84 74  
Equity in the earnings of investee 19 11 $ 35 25  
Long-term advances, average interest rate     1.31%   1.31%
Conrail Inc | Affiliated Entity          
Schedule of Investments [Line Items]          
Other liabilities $ 534   $ 534   $ 534
TTX Company          
Schedule of Investments [Line Items]          
Equity method investment, ownership percentage 19.78%   19.78%    
Equity in the earnings of investee $ 12 11 $ 21 21  
Purchased services and rents $ 69 $ 66 $ 135 $ 130