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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 46,505 | $ 45,530
Accumulated Depreciation | (13,490) | (13,086)
Properties - Net (Note 6) | 33,015 | 32,444
Total Road |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 34,076 | 33,109
Accumulated Depreciation | (9,694) | (9,138)
Properties - Net (Note 6) | 24,382 | 23,971
Rail and Other Track Material |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 8,761 | 8,449
Accumulated Depreciation | (1,835) | (1,739)
Properties - Net (Note 6) | $ 6,926 | $ 6,710
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 | $ 6,522 | $ 6,284
Accumulated Depreciation | (1,923) | (1,780)
Properties - Net (Note 6) | $ 4,599 | $ 4,504
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 | $ 2,751 | $ 2,768
Accumulated Depreciation | (624) | (614)
Properties - Net (Note 6) | $ 2,127 | $ 2,154
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 | $ 3,289 | $ 3,238
Accumulated Depreciation | (1,094) | (1,051)
Properties - Net (Note 6) | $ 2,195 | $ 2,187
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 | $ 2,794 | $ 2,688
Accumulated Depreciation | (411) | (380)
Properties - Net (Note 6) | $ 2,383 | $ 2,308
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 | $ 3,266 | $ 3,170
Accumulated Depreciation | (1,086) | (944)
Properties - Net (Note 6) | $ 2,180 | $ 2,226
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 | $ 1,388 | $ 1,366
Accumulated Depreciation | (514) | (529)
Properties - Net (Note 6) | $ 874 | $ 837
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 | $ 5,305 | $ 5,146
Accumulated Depreciation | (2,207) | (2,101)
Properties - Net (Note 6) | $ 3,098 | $ 3,045
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 | $ 10,125 | $ 10,227
Accumulated Depreciation | (3,796) | (3,948)
Properties - Net (Note 6) | 6,329 | 6,279
Locomotive |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 4,912 | 5,085
Accumulated Depreciation | (1,732) | (1,849)
Properties - Net (Note 6) | $ 3,180 | $ 3,236
Annual Depreciation Rate | 3.60% | 3.60%
Estimated useful life (Avg. Years) | 27 years | 27 years
Freight Cars |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,322 | $ 2,557
Accumulated Depreciation | (358) | (540)
Properties - Net (Note 6) | $ 1,964 | $ 2,017
Annual Depreciation Rate | 2.90% | 2.90%
Estimated useful life (Avg. Years) | 35 years | 35 years
Work Equipment and Other |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,891 | $ 2,585
Accumulated Depreciation | (1,706) | (1,559)
Properties - Net (Note 6) | $ 1,185 | $ 1,026
Annual Depreciation Rate | 8.20% | 8.20%
Estimated useful life (Avg. Years) | 12 years | 12 years
Land |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,885 | $ 1,823
Properties - Net (Note 6) | 1,885 | 1,823
Construction In Progress |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 419 | 371
Properties - Net (Note 6) | $ 419 | $ 371

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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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