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Investments (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
railroad
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]          
Number of North American railroads | railroad     8    
Impairment of investment     $ 99 $ 0  
Equity Method Investment, Nonconsolidated Investee, Other          
Schedule of Investments [Line Items]          
Impairment of investment $ 99        
Equity method invesment impact on net income (loss) $ 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 $ 1,400   $ 1,400   $ 1,400
Expenses from transactions with related party 32 $ 37 97 112  
Equity in the earnings of investee 17 13 39 36  
Due to affiliate, noncurrent $ 280   $ 280   $ 280
Due to affiliate, average interest rate     2.90%   2.90%
TTX Company          
Schedule of Investments [Line Items]          
Equity method investment, ownership percentage 19.65%   19.65%    
Expenses from transactions with related party $ 67 61 $ 185 183  
Equity in the earnings of investee $ 21 $ 19 $ 35 $ 44