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Properties - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |
Percentage of labor costs relating to the deconstruction of old track | 20.00% |  |  |  |
Percentage of labor costs relating to the installation of new track | 80.00% |  |  |  |
Percentage of assets depreciated under the group-life method | 87.00% |  |  |  |
Properties | $ 45,530 | $ 45,100 | [1] |  |
Depreciation | 1,383 | 1,349 | [1] | $ 1,331 | [1]
Gains on sale of properties | 35 | 151 |  | 154 |
Impairment expense | 8 | 22 |  | $ 24 |
Total Equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Properties | $ 10,227 | 10,708 |  |  |
Life studies, frequency period | 3 years |  |  |  |
Total Road |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Properties | $ 33,109 | $ 32,125 |  |  |
Life studies, frequency period | 6 years |  |  |  |
[1] | Certain prior year data has been reclassified to conform to the current presentation.

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- Definition Percentage of labor costs relating to the deconstruction of old track based upon an analysis of track replacement process. + References No definition available. + Details
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