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Properties (Railroad Assets, Non-Railroad Assets, and Capital Expenditure) (Details) | 12 Months Ended
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Dec. 25, 2015 USD ($) categories | Dec. 26, 2014 USD ($) | Dec. 27, 2013 USD ($)
Railroad Assets [Abstract] |  |  |
Percentage of assets depreciated under the group-life method | 86.00% |  |
Total fixed assets | $ 41,574,000,000 | $ 39,343,000,000 |
Annual depreciation expense | $ 1,208,000,000 | 1,151,000,000 | $ 1,104,000,000
Capital Expenditures [Abstract] |  |  |
Percentage of labor costs relating to the deconstruction of old track (In hundredths) | 20.00% |  |
Percentage of labor costs relating to the installation of new track (In hundredths) | 80.00% |  |
Minimum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Number of depreciable asset categories for railroad assets | categories | 130 |  |
Road - Ties [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | $ 5,077,000,000 | 4,807,000,000 |
Number of depreciable asset categories for railroad assets | categories | 18 |  |
Total Equipment [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | $ 11,108,000,000 | $ 10,108,000,000 |
Life studies, frequency period | 3 years |  |
Total Equipment [Member] | Minimum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 3 years | 3 years |
Total Equipment [Member] | Maximum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 38 years | 38 years |
Road - Total [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Total fixed assets | $ 27,564,000,000 | $ 26,125,000,000 |
Life studies, frequency period | 6 years |  |
Road - Total [Member] | Minimum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 8 years | 8 years |
Road - Total [Member] | Maximum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 90 years | 90 years |
Technology Equipment [Member] | Minimum [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Estimated useful life | 3 years |  |
Abnormal gain (loss) on operating property [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Abnormal gains and losses | $ 23,000,000 | $ 0 | $ 65,000,000
Gain (loss) on non-operating property [Member] |  |  |
Railroad Assets [Abstract] |  |  |
Abnormal gains and losses | $ 59,000,000 |  |

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- Definition Number of depreciable asset categories to account for depreciation expense for the railroad assets that are depreciated under the group life method. + References No definition available. + Details
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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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