v3.25.2
Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Equipment and other rents $ 230 $ 219 $ 471 $ 435  
Accounts payable, current 815   815   $ 847
UPRR | Equity Method Investee          
Related Party Transaction [Line Items]          
Equipment and other rents 109 $ 107 221 $ 209  
Accounts payable, current $ 71   $ 71   70
UPRR | TTX Company          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 37.03%   37.03%    
Equity method investments $ 1,900   $ 1,900   $ 1,900