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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 45,100 | $ 44,805
Accumulated Depreciation | (12,932) | (12,807)
Properties - Net (Note 6) | 32,168 | 31,998
Total Road |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 32,125 | 31,411
Accumulated Depreciation | (8,618) | (8,323)
Properties - Net (Note 6) | 23,507 | 23,088
Rail and Other Track Material |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 8,194 | 7,964
Accumulated Depreciation | (1,719) | (1,698)
Properties - Net (Note 6) | $ 6,475 | $ 6,266
Annual Depreciation Rate | 2.50% | 2.50%
Estimated useful life (Avg. Years) | 40 years | 40 years
Ties |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 6,041 | $ 5,860
Accumulated Depreciation | (1,666) | (1,557)
Properties - Net (Note 6) | $ 4,375 | $ 4,303
Annual Depreciation Rate | 3.70% | 3.70%
Estimated useful life (Avg. Years) | 27 years | 27 years
Grading |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,763 | $ 2,757
Accumulated Depreciation | (595) | (572)
Properties - Net (Note 6) | $ 2,168 | $ 2,185
Annual Depreciation Rate | 1.40% | 1.40%
Estimated useful life (Avg. Years) | 72 years | 72 years
Ballast |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,156 | $ 3,076
Accumulated Depreciation | (1,013) | (971)
Properties - Net (Note 6) | $ 2,143 | $ 2,105
Annual Depreciation Rate | 2.70% | 2.70%
Estimated useful life (Avg. Years) | 37 years | 37 years
Bridges, Trestles, and Culverts |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,529 | $ 2,506
Accumulated Depreciation | (334) | (382)
Properties - Net (Note 6) | $ 2,195 | $ 2,124
Annual Depreciation Rate | 1.60% | 1.60%
Estimated useful life (Avg. Years) | 61 years | 61 years
Signals and Interlockers |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,077 | $ 2,975
Accumulated Depreciation | (819) | (693)
Properties - Net (Note 6) | $ 2,258 | $ 2,282
Annual Depreciation Rate | 4.00% | 4.00%
Estimated useful life (Avg. Years) | 25 years | 25 years
Buildings |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,335 | $ 1,318
Accumulated Depreciation | (492) | (486)
Properties - Net (Note 6) | $ 843 | $ 832
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 | $ 5,030 | $ 4,955
Accumulated Depreciation | (1,980) | (1,964)
Properties - Net (Note 6) | $ 3,050 | $ 2,991
Annual Depreciation Rate | 4.20% | 4.20%
Estimated useful life (Avg. Years) | 24 years | 24 years
Total Equipment |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 10,708 | $ 11,092
Accumulated Depreciation | (4,314) | (4,484)
Properties - Net (Note 6) | 6,394 | 6,608
Locomotive |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 5,320 | 5,661
Accumulated Depreciation | (2,020) | (2,266)
Properties - Net (Note 6) | $ 3,300 | $ 3,395
Annual Depreciation Rate | 3.60% | 3.50%
Estimated useful life (Avg. Years) | 27 years | 29 years
Freight Cars |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,964 | $ 3,093
Accumulated Depreciation | (880) | (882)
Properties - Net (Note 6) | $ 2,084 | $ 2,211
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 | $ 2,424 | $ 2,338
Accumulated Depreciation | (1,414) | (1,336)
Properties - Net (Note 6) | $ 1,010 | $ 1,002
Annual Depreciation Rate | 8.20% | 7.40%
Estimated useful life (Avg. Years) | 12 years | 14 years
Land |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,836 | $ 1,845
Properties - Net (Note 6) | 1,836 | 1,845
Construction In Progress |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 431 | 457
Properties - Net (Note 6) | $ 431 | $ 457

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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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