XML 64 R54.htm IDEA: XBRL DOCUMENT v3.25.1
Properties (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]      
Cost   $ 84,558 $ 83,840
Accumulated depreciation   25,848 25,497
Net book value   58,710 58,343
Land      
Property, Plant and Equipment [Line Items]      
Cost   5,449 5,441
Net book value   5,449 5,441
Total road      
Property, Plant and Equipment [Line Items]      
Cost   62,437 62,049
Accumulated depreciation   19,892 19,614
Net book value   42,545 42,435
Rail and other track material      
Property, Plant and Equipment [Line Items]      
Cost   19,392 19,283
Accumulated depreciation   7,717 7,642
Net book value   $ 11,675 $ 11,641
Estimated useful life   45 years 46 years
Ties      
Property, Plant and Equipment [Line Items]      
Cost   $ 12,473 $ 12,358
Accumulated depreciation   4,166 4,109
Net book value   $ 8,307 $ 8,249
Estimated useful life   34 years 34 years
Ballast      
Property, Plant and Equipment [Line Items]      
Cost   $ 6,531 $ 6,495
Accumulated depreciation   2,216 2,182
Net book value   $ 4,315 $ 4,313
Estimated useful life   34 years 34 years
Other roadway      
Property, Plant and Equipment [Line Items]      
Cost   $ 24,041 $ 23,913
Accumulated depreciation   5,793 5,681
Net book value   $ 18,248 $ 18,232
Estimated useful life   47 years 47 years
Total equipment      
Property, Plant and Equipment [Line Items]      
Cost   $ 14,052 $ 13,750
Accumulated depreciation   5,345 5,243
Net book value   8,707 8,507
Locomotives      
Property, Plant and Equipment [Line Items]      
Cost   9,731 9,517
Accumulated depreciation   3,785 3,724
Net book value   $ 5,946 $ 5,793
Estimated useful life   18 years 18 years
Freight cars      
Property, Plant and Equipment [Line Items]      
Cost   $ 3,074 $ 3,011
Accumulated depreciation   1,061 1,037
Net book value   $ 2,013 $ 1,974
Estimated useful life   23 years 22 years
Work equipment and other      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,247 $ 1,222
Accumulated depreciation   499 482
Net book value   $ 748 $ 740
Estimated useful life   17 years 17 years
Technology and other      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,390 $ 1,431
Accumulated depreciation   611 640
Net book value   $ 779 $ 791
Estimated useful life   12 years 12 years
Construction in progress      
Property, Plant and Equipment [Line Items]      
Cost   $ 1,230 $ 1,169
Accumulated depreciation   0 0
Net book value   $ 1,230 $ 1,169
Chassis assets | Other Expense      
Property, Plant and Equipment [Line Items]      
Gain recognized in other expense $ 46