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Properties - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
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% |  |
Total fixed assets | $ 44,805 | $ 44,324 |
Abnormal gains and losses | 154 | 18 | $ 128
Impairment expense | 24 | 25 |
Total Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total fixed assets | $ 11,092 | 11,606 |
Life studies, frequency period | 3 years |  |
Total Road |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total fixed assets | $ 31,411 | $ 30,091 |
Life studies, frequency period | 6 years |  |

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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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