v3.26.3
Properties (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Cost $ 88,360 $ 86,404
Accumulated depreciation 27,734 26,759
Net book value 60,626 59,645
Land    
Property, Plant, and Equipment [Line Items]    
Cost 5,495 5,471
Net book value 5,495 5,471
Total road    
Property, Plant, and Equipment [Line Items]    
Cost 65,032 63,782
Accumulated depreciation 21,390 20,630
Net book value 43,642 43,152
Rail and other track material    
Property, Plant, and Equipment [Line Items]    
Cost 20,040 19,747
Accumulated depreciation 8,150 7,936
Net book value $ 11,890 $ 11,811
Estimated useful life 43 years 45 years
Ties    
Property, Plant, and Equipment [Line Items]    
Cost $ 13,106 $ 12,779
Accumulated depreciation 4,448 4,305
Net book value $ 8,658 $ 8,474
Estimated useful life 34 years 34 years
Ballast    
Property, Plant, and Equipment [Line Items]    
Cost $ 6,783 $ 6,646
Accumulated depreciation 2,402 2,309
Net book value $ 4,381 $ 4,337
Estimated useful life 34 years 34 years
Other roadway    
Property, Plant, and Equipment [Line Items]    
Cost $ 25,103 $ 24,610
Accumulated depreciation 6,390 6,080
Net book value $ 18,713 $ 18,530
Estimated useful life 47 years 47 years
Total equipment    
Property, Plant, and Equipment [Line Items]    
Cost $ 14,791 $ 14,324
Accumulated depreciation 5,611 5,460
Net book value 9,180 8,864
Locomotives    
Property, Plant, and Equipment [Line Items]    
Cost 10,278 9,926
Accumulated depreciation 3,853 3,813
Net book value $ 6,425 $ 6,113
Estimated useful life 17 years 18 years
Freight cars    
Property, Plant, and Equipment [Line Items]    
Cost $ 3,116 $ 3,080
Accumulated depreciation 1,173 1,107
Net book value $ 1,943 $ 1,973
Estimated useful life 22 years 23 years
Work equipment and other    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,397 $ 1,318
Accumulated depreciation 585 540
Net book value $ 812 $ 778
Estimated useful life 17 years 17 years
Technology and other    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,451 $ 1,414
Accumulated depreciation 733 669
Net book value $ 718 $ 745
Estimated useful life 12 years 12 years
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Cost $ 1,591 $ 1,413
Net book value $ 1,591 $ 1,413