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Investments (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
railroad
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]          
Number of North American railroads | railroad     8    
Impairment of investment     $ 0 $ 99  
Equity Method Investment, Nonconsolidated Investee, Other          
Schedule of Investments [Line Items]          
Impairment of investment   $ 99      
Loss due to noncash impairment charges against equity method investment   (74)   (74)  
Equity Method Investee          
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 $ 1,500   $ 1,500   $ 1,400
Expenses from transactions with related party 37 32 108 97  
Equity in the earnings of investee 14 17 42 39  
Due to affiliate, noncurrent $ 534   $ 534   $ 534
Due to affiliate, average interest rate     1.31%   1.31%
TTX Company          
Schedule of Investments [Line Items]          
Equity method investment, ownership percentage 19.65%   19.65%    
Expenses from transactions with related party $ 59 67 $ 183 185  
Equity in the earnings of investee $ 12 $ 21 $ 43 $ 35