v3.26.1
Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]      
Equipment and other rents $ 219 $ 241  
Accounts payable, current 940   $ 804
UPRR | Equity Method Investee      
Related Party Transaction [Line Items]      
Equipment and other rents 105 $ 112  
Accounts payable, current $ 70   72
UPRR | TTX Company      
Related Party Transaction [Line Items]      
Equity method investment, ownership percentage 37.03%    
Equity method investments $ 2,000   $ 2,000