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v3.25.2

Properties (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 85,173 | $ 83,840
Accumulated depreciation |  | 26,156 | 25,497
Net book value |  | 59,017 | 58,343
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 5,450 | 5,441
Net book value |  | 5,450 | 5,441
Total road |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 62,885 | 62,049
Accumulated depreciation |  | 20,145 | 19,614
Net book value |  | 42,740 | 42,435
Rail and other track material |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 19,515 | 19,283
Accumulated depreciation |  | 7,797 | 7,642
Net book value |  | $ 11,718 | $ 11,641
Estimated useful life |  | 45 years | 46 years
Ties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 12,593 | $ 12,358
Accumulated depreciation |  | 4,206 | 4,109
Net book value |  | $ 8,387 | $ 8,249
Estimated useful life |  | 34 years | 34 years
Ballast |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 6,575 | $ 6,495
Accumulated depreciation |  | 2,245 | 2,182
Net book value |  | $ 4,330 | $ 4,313
Estimated useful life |  | 34 years | 34 years
Other roadway |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 24,202 | $ 23,913
Accumulated depreciation |  | 5,897 | 5,681
Net book value |  | $ 18,305 | $ 18,232
Estimated useful life |  | 47 years | 47 years
Total equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 14,143 | $ 13,750
Accumulated depreciation |  | 5,387 | 5,243
Net book value |  | 8,756 | 8,507
Locomotives |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 9,793 | 9,517
Accumulated depreciation |  | 3,799 | 3,724
Net book value |  | $ 5,994 | $ 5,793
Estimated useful life |  | 18 years | 18 years
Freight cars |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 3,077 | $ 3,011
Accumulated depreciation |  | 1,073 | 1,037
Net book value |  | $ 2,004 | $ 1,974
Estimated useful life |  | 23 years | 22 years
Work equipment and other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 1,273 | $ 1,222
Accumulated depreciation |  | 515 | 482
Net book value |  | $ 758 | $ 740
Estimated useful life |  | 17 years | 17 years
Technology and other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 1,390 | $ 1,431
Accumulated depreciation |  | 624 | 640
Net book value |  | $ 766 | $ 791
Estimated useful life |  | 12 years | 12 years
Construction in progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 1,305 | $ 1,169
Net book value |  | $ 1,305 | $ 1,169
Chassis assets | Other Expense |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gain recognized in other expense | $ 46 |  |

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