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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 48,105 | $ 46,505
Accumulated depreciation | (13,863) | (13,490)
Net book value | 34,242 | 33,015
Total Road |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 34,792 | 34,076
Accumulated depreciation | (9,727) | (9,694)
Net book value | 25,065 | 24,382
Rail and Other Track Material |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 8,660 | 8,761
Accumulated depreciation | (1,405) | (1,835)
Net book value | $ 7,255 | $ 6,926
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 | $ 6,763 | $ 6,522
Accumulated depreciation | (2,010) | (1,923)
Net book value | $ 4,753 | $ 4,599
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 | $ 2,741 | $ 2,751
Accumulated depreciation | (637) | (624)
Net book value | $ 2,104 | $ 2,127
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 | $ 3,383 | $ 3,289
Accumulated depreciation | (1,130) | (1,094)
Net book value | $ 2,253 | $ 2,195
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 | $ 2,989 | $ 2,794
Accumulated depreciation | (454) | (411)
Net book value | $ 2,535 | $ 2,383
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 | $ 3,299 | $ 3,266
Accumulated depreciation | (1,210) | (1,086)
Net book value | $ 2,089 | $ 2,180
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 | $ 1,416 | $ 1,388
Accumulated depreciation | (558) | (514)
Net book value | $ 858 | $ 874
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 | $ 5,541 | $ 5,305
Accumulated depreciation | (2,323) | (2,207)
Net book value | $ 3,218 | $ 3,098
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 | $ 10,296 | $ 10,125
Accumulated depreciation | (4,136) | (3,796)
Net book value | 6,160 | 6,329
Locomotive |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 4,848 | 4,912
Accumulated depreciation | (1,856) | (1,732)
Net book value | $ 2,992 | $ 3,180
Annual depreciation rate | 3.80% | 3.60%
Estimated useful life (avg. years) | 26 years | 27 years
Freight Cars |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,316 | $ 2,322
Accumulated depreciation | (369) | (358)
Net book value | $ 1,947 | $ 1,964
Annual depreciation rate | 3.10% | 2.90%
Estimated useful life (avg. years) | 32 years | 35 years
Work Equipment and Other |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,132 | $ 2,891
Accumulated depreciation | (1,911) | (1,706)
Net book value | $ 1,221 | $ 1,185
Annual depreciation rate | 8.90% | 8.20%
Estimated useful life (avg. years) | 11 years | 12 years
Land |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,272 | $ 1,885
Net book value | 2,272 | 1,885
Construction In Progress |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 745 | 419
Net book value | $ 745 | $ 419

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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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