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Properties - Schedule of Net Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 44,805 | $ 44,324
Accumulated Depreciation | (12,807) | (12,560)
Properties - Net | 31,998 | 31,764
Total Road |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 31,411 | 30,091
Accumulated Depreciation | (8,323) | (7,790)
Properties - Net | 23,088 | 22,301
Rail and Other Track Material |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 7,964 | 7,694
Accumulated Depreciation | (1,698) | (1,606)
Properties - Net | $ 6,266 | $ 6,088
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 | $ 5,860 | $ 5,665
Accumulated Depreciation | (1,557) | (1,446)
Properties - Net | $ 4,303 | $ 4,219
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 | $ 2,757 | $ 2,662
Accumulated Depreciation | (572) | (542)
Properties - Net | $ 2,185 | $ 2,120
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 | $ 3,076 | $ 2,994
Accumulated Depreciation | (971) | (921)
Properties - Net | $ 2,105 | $ 2,073
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 | $ 2,506 | $ 2,405
Accumulated Depreciation | (382) | (356)
Properties - Net | $ 2,124 | $ 2,049
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 | $ 2,975 | $ 2,759
Accumulated Depreciation | (693) | (588)
Properties - Net | $ 2,282 | $ 2,171
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 | $ 1,318 | $ 1,278
Accumulated Depreciation | (486) | (464)
Properties - Net | $ 832 | $ 814
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 | $ 4,955 | $ 4,634
Accumulated Depreciation | (1,964) | (1,867)
Properties - Net | $ 2,991 | $ 2,767
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 | $ 11,092 | $ 11,606
Accumulated Depreciation | (4,484) | (4,770)
Properties - Net | 6,608 | 6,836
Locomotive |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 5,661 | 6,083
Accumulated Depreciation | (2,266) | (2,490)
Properties - Net | $ 3,395 | $ 3,593
Annual Depreciation Rate | 3.50% | 3.50%
Estimated useful life (Avg. Years) | 29 years | 29 years
Freight Cars |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,093 | $ 3,262
Accumulated Depreciation | (882) | (998)
Properties - Net | $ 2,211 | $ 2,264
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 | $ 2,338 | $ 2,261
Accumulated Depreciation | (1,336) | (1,282)
Properties - Net | $ 1,002 | $ 979
Annual Depreciation Rate | 7.40% | 7.40%
Estimated useful life (Avg. Years) | 14 years | 14 years
Land |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,845 | $ 1,849
Properties - Net | 1,845 | 1,849
Construction In Progress |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 457 | 778
Properties - Net | $ 457 | $ 778

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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 Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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