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Properties (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]      
Cost   $ 85,848 $ 83,840
Accumulated depreciation   26,456 25,497
Net book value   59,392 58,343
Land      
Property, Plant and Equipment [Line Items]      
Cost   5,455 5,441
Net book value   5,455 5,441
Total road      
Property, Plant and Equipment [Line Items]      
Cost   63,348 62,049
Accumulated depreciation   20,388 19,614
Net book value   42,960 42,435
Rail and other track material      
Property, Plant and Equipment [Line Items]      
Cost   19,646 19,283
Accumulated depreciation   7,858 7,642
Net book value   $ 11,788 $ 11,641
Estimated useful life   45 years 46 years
Ties      
Property, Plant and Equipment [Line Items]      
Cost   $ 12,699 $ 12,358
Accumulated depreciation   4,251 4,109
Net book value   $ 8,448 $ 8,249
Estimated useful life   34 years 34 years
Ballast      
Property, Plant and Equipment [Line Items]      
Cost   $ 6,618 $ 6,495
Accumulated depreciation   2,274 2,182
Net book value   $ 4,344 $ 4,313
Estimated useful life   34 years 34 years
Other roadway      
Property, Plant and Equipment [Line Items]      
Cost   $ 24,385 $ 23,913
Accumulated depreciation   6,005 5,681
Net book value   $ 18,380 $ 18,232
Estimated useful life   47 years 47 years
Total equipment      
Property, Plant and Equipment [Line Items]      
Cost   $ 14,249 $ 13,750
Accumulated depreciation   5,431 5,243
Net book value   8,818 8,507
Locomotives      
Property, Plant and Equipment [Line Items]      
Cost   9,899 9,517
Accumulated depreciation   3,819 3,724
Net book value   $ 6,080 $ 5,793
Estimated useful life   18 years 18 years
Freight cars      
Property, Plant and Equipment [Line Items]      
Cost   $ 3,063 $ 3,011
Accumulated depreciation   1,088 1,037
Net book value   $ 1,975 $ 1,974
Estimated useful life   23 years 22 years
Work equipment and other      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,287 $ 1,222
Accumulated depreciation   524 482
Net book value   $ 763 $ 740
Estimated useful life   17 years 17 years
Technology and other      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,386 $ 1,431
Accumulated depreciation   637 640
Net book value   $ 749 $ 791
Estimated useful life   12 years 12 years
Construction in progress      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,410 $ 1,169
Net book value   $ 1,410 $ 1,169
Chassis assets | Other Expense      
Property, Plant and Equipment [Line Items]      
Gain recognized in other expense $ 46