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Investments (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
railroad
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]          
Other liabilities $ 1,824   $ 1,824   $ 1,759
Number of railroads | railroad     6    
Purchased services and rents $ 517 $ 484 $ 1,519 $ 1,402  
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 42 123 116  
Equity in the earnings of investee 15 15 50 40  
Other liabilities $ 534   $ 534   $ 534
Long-term advances, average interest rate     1.31%   1.31%
TTX Company          
Schedule of Investments [Line Items]          
Equity method investment, ownership percentage 19.78%   19.78%    
Equity in the earnings of investee $ 13 18 $ 34 39  
Purchased services and rents $ 66 $ 63 $ 201 $ 193