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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 50,320 | $ 48,105
Accumulated depreciation | (15,385) | (13,863)
Net book value | 34,935 | 34,242
Total Road |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 36,590 | 34,792
Accumulated depreciation | (10,926) | (9,727)
Net book value | 25,664 | 25,065
Rail and Other Track Material |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 9,537 | 8,660
Accumulated depreciation | (1,978) | (1,405)
Net book value | $ 7,559 | $ 7,255
Annual depreciation rate | 2.50% | 2.50%
Estimated useful life (avg. years) | 41 years | 41 years
Ties |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 7,020 | $ 6,763
Accumulated depreciation | (2,131) | (2,010)
Net book value | $ 4,889 | $ 4,753
Annual depreciation rate | 3.50% | 3.50%
Estimated useful life (avg. years) | 28 years | 28 years
Grading |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,796 | $ 2,741
Accumulated depreciation | (668) | (637)
Net book value | $ 2,128 | $ 2,104
Annual depreciation rate | 1.30% | 1.30%
Estimated useful life (avg. years) | 75 years | 75 years
Ballast |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,424 | $ 3,383
Accumulated depreciation | (1,119) | (1,130)
Net book value | $ 2,305 | $ 2,253
Annual depreciation rate | 2.60% | 2.60%
Estimated useful life (avg. years) | 38 years | 38 years
Bridges, Trestles, and Culverts |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,121 | $ 2,989
Accumulated depreciation | (525) | (454)
Net book value | $ 2,596 | $ 2,535
Annual depreciation rate | 1.70% | 1.70%
Estimated useful life (avg. years) | 60 years | 60 years
Signals and Interlockers |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,376 | $ 3,299
Accumulated depreciation | (1,351) | (1,210)
Net book value | $ 2,025 | $ 2,089
Annual depreciation rate | 4.10% | 4.10%
Estimated useful life (avg. years) | 24 years | 24 years
Buildings |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,530 | $ 1,416
Accumulated depreciation | (608) | (558)
Net book value | $ 922 | $ 858
Annual depreciation rate | 2.50% | 2.50%
Estimated useful life (avg. years) | 40 years | 40 years
Other |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 5,786 | $ 5,541
Accumulated depreciation | (2,546) | (2,323)
Net book value | $ 3,240 | $ 3,218
Annual depreciation rate | 4.10% | 4.10%
Estimated useful life (avg. years) | 25 years | 25 years
Total Equipment |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 10,643 | $ 10,296
Accumulated depreciation | (4,459) | (4,136)
Net book value | 6,184 | 6,160
Locomotive |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 4,952 | 4,848
Accumulated depreciation | (1,981) | (1,856)
Net book value | $ 2,971 | $ 2,992
Annual depreciation rate | 3.80% | 3.80%
Estimated useful life (avg. years) | 26 years | 26 years
Freight Cars |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,300 | $ 2,316
Accumulated depreciation | (378) | (369)
Net book value | $ 1,922 | $ 1,947
Annual depreciation rate | 3.10% | 3.10%
Estimated useful life (avg. years) | 32 years | 32 years
Work Equipment and Other |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,391 | $ 3,132
Accumulated depreciation | (2,100) | (1,911)
Net book value | $ 1,291 | $ 1,221
Annual depreciation rate | 8.90% | 8.90%
Estimated useful life (avg. years) | 11 years | 11 years
Land |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,272 | $ 2,272
Net book value | 2,272 | 2,272
Construction In Progress |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 815 | 745
Net book value | $ 815 | $ 745

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- Definition The composite annual depreciation rate used to depreciate rail assets, including main-line track, locomotives and freight cars using the group-life method of accounting. All other depreciable assets are depreciated on a straight-line basis. The group-life method aggregates assets with similar lives and characteristics into groups and depreciates each of these groups as a whole. When using the group-life method, an underlying assumption is that each group of assets, as a whole, is used and depreciated to the end of its recoverable life. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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