v3.26.1
Properties (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Cost $ 87,624 $ 86,404
Accumulated depreciation 27,425 26,759
Net book value 60,199 59,645
Land    
Property, Plant, and Equipment [Line Items]    
Cost 5,493 5,471
Net book value 5,493 5,471
Total road    
Property, Plant, and Equipment [Line Items]    
Cost 64,511 63,782
Accumulated depreciation 21,157 20,630
Net book value 43,354 43,152
Rail and other track material    
Property, Plant, and Equipment [Line Items]    
Cost 19,905 19,747
Accumulated depreciation 8,089 7,936
Net book value $ 11,816 $ 11,811
Estimated useful life 43 years 45 years
Ties    
Property, Plant, and Equipment [Line Items]    
Cost $ 12,998 $ 12,779
Accumulated depreciation 4,405 4,305
Net book value $ 8,593 $ 8,474
Estimated useful life 34 years 34 years
Ballast    
Property, Plant, and Equipment [Line Items]    
Cost $ 6,729 $ 6,646
Accumulated depreciation 2,375 2,309
Net book value $ 4,354 $ 4,337
Estimated useful life 34 years 34 years
Other roadway    
Property, Plant, and Equipment [Line Items]    
Cost $ 24,879 $ 24,610
Accumulated depreciation 6,288 6,080
Net book value $ 18,591 $ 18,530
Estimated useful life 47 years 47 years
Total equipment    
Property, Plant, and Equipment [Line Items]    
Cost $ 14,580 $ 14,324
Accumulated depreciation 5,544 5,460
Net book value 9,036 8,864
Locomotives    
Property, Plant, and Equipment [Line Items]    
Cost 10,127 9,926
Accumulated depreciation 3,817 3,813
Net book value $ 6,310 $ 6,113
Estimated useful life 17 years 18 years
Freight cars    
Property, Plant, and Equipment [Line Items]    
Cost $ 3,091 $ 3,080
Accumulated depreciation 1,155 1,107
Net book value $ 1,936 $ 1,973
Estimated useful life 22 years 23 years
Work equipment and other    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,362 $ 1,318
Accumulated depreciation 572 540
Net book value $ 790 $ 778
Estimated useful life 17 years 17 years
Technology and other    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,461 $ 1,414
Accumulated depreciation 724 669
Net book value $ 737 $ 745
Estimated useful life 12 years 12 years
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,579 $ 1,413
Net book value $ 1,579 $ 1,413