v3.26.1
Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]          
Equipment and other rents $ 214 $ 230 $ 433 $ 471  
Accounts payable, current 931   931   $ 804
UPRR | Equity Method Investee          
Related Party Transaction [Line Items]          
Equipment and other rents 111 $ 109 216 $ 221  
Accounts payable, current $ 74   $ 74   72
UPRR | TTX Company          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 37.03%   37.03%    
Equity method investments $ 2,000   $ 2,000   $ 2,000