v3.26.3
Investments (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
railroad
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]          
Other liabilities $ 1,702   $ 1,702   $ 1,723
Number of railroads | railroad     6    
Purchased services and rents $ 546 $ 519 $ 1,618 $ 1,537  
Conrail, Economic          
Schedule of Investments [Line Items]          
Equity method investment, ownership (as a percent) 58.00%   58.00%    
Conrail, Voting          
Schedule of Investments [Line Items]          
Equity method investment, ownership (as a percent) 50.00%   50.00%    
Conrail Inc          
Schedule of Investments [Line Items]          
Equity method investments $ 1,900   $ 1,900   1,800
Expenses for operation of the Shared Assets Areas 46 47 149 140  
Equity in the earnings of investee 21 20 60 59  
Other liabilities $ 534   $ 534   $ 534
Due to affiliate, average interest rate (as a percent)     1.31%   1.31%
TTX Company          
Schedule of Investments [Line Items]          
Equity method investment, ownership (as a percent) 19.78%   19.78%    
Equity in the earnings of investee $ 14 13 $ 30 33  
Purchased services and rents $ 82 $ 81 $ 243 $ 236