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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 45,530 | $ 45,100 | [1]
Accumulated Depreciation | (13,086) | (12,932) | [1]
Properties - Net (Note 6) | 32,444 | 32,168 | [1]
Total Road |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | 33,109 | 32,125 |
Accumulated Depreciation | (9,138) | (8,618) |
Properties - Net (Note 6) | 23,971 | 23,507 |
Rail and Other Track Material |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | 8,449 | 8,194 |
Accumulated Depreciation | (1,739) | (1,719) |
Properties - Net (Note 6) | $ 6,710 | $ 6,475 |
Annual Depreciation Rate | 2.50% | 2.50% |
Estimated useful life (Avg. Years) | 41 years | 40 years |
Ties |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 6,284 | $ 6,041 |
Accumulated Depreciation | (1,780) | (1,666) |
Properties - Net (Note 6) | $ 4,504 | $ 4,375 |
Annual Depreciation Rate | 3.50% | 3.70% |
Estimated useful life (Avg. Years) | 28 years | 27 years |
Grading |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 2,768 | $ 2,763 |
Accumulated Depreciation | (614) | (595) |
Properties - Net (Note 6) | $ 2,154 | $ 2,168 |
Annual Depreciation Rate | 1.30% | 1.40% |
Estimated useful life (Avg. Years) | 75 years | 72 years |
Ballast |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 3,238 | $ 3,156 |
Accumulated Depreciation | (1,051) | (1,013) |
Properties - Net (Note 6) | $ 2,187 | $ 2,143 |
Annual Depreciation Rate | 2.60% | 2.70% |
Estimated useful life (Avg. Years) | 38 years | 37 years |
Bridges, Trestles, and Culverts |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 2,688 | $ 2,529 |
Accumulated Depreciation | (380) | (334) |
Properties - Net (Note 6) | $ 2,308 | $ 2,195 |
Annual Depreciation Rate | 1.70% | 1.60% |
Estimated useful life (Avg. Years) | 60 years | 61 years |
Signals and Interlockers |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 3,170 | $ 3,077 |
Accumulated Depreciation | (944) | (819) |
Properties - Net (Note 6) | $ 2,226 | $ 2,258 |
Annual Depreciation Rate | 4.10% | 4.00% |
Estimated useful life (Avg. Years) | 24 years | 25 years |
Buildings |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 1,366 | $ 1,335 |
Accumulated Depreciation | (529) | (492) |
Properties - Net (Note 6) | $ 837 | $ 843 |
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 | $ 5,146 | $ 5,030 |
Accumulated Depreciation | (2,101) | (1,980) |
Properties - Net (Note 6) | $ 3,045 | $ 3,050 |
Annual Depreciation Rate | 4.10% | 4.20% |
Estimated useful life (Avg. Years) | 25 years | 24 years |
Total Equipment |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | $ 10,227 | $ 10,708 |
Accumulated Depreciation | (3,948) | (4,314) |
Properties - Net (Note 6) | 6,279 | 6,394 |
Locomotive |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | 5,085 | 5,320 |
Accumulated Depreciation | (1,849) | (2,020) |
Properties - Net (Note 6) | $ 3,236 | $ 3,300 |
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 | $ 2,557 | $ 2,964 |
Accumulated Depreciation | (540) | (880) |
Properties - Net (Note 6) | $ 2,017 | $ 2,084 |
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 | $ 2,585 | $ 2,424 |
Accumulated Depreciation | (1,559) | (1,414) |
Properties - Net (Note 6) | $ 1,026 | $ 1,010 |
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 | $ 1,823 | $ 1,836 |
Properties - Net (Note 6) | 1,823 | 1,836 |
Construction In Progress |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Cost | 371 | 431 |
Properties - Net (Note 6) | $ 371 | $ 431 |
[1] | Certain prior year data has been reclassified to conform to the current presentation.

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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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