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Properties (Detail of Net Properties) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 25, 2015 | Dec. 26, 2014
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 41,574 | $ 39,343
Accumulated Depreciation | (11,400) | (10,759)
Properties - Net | 30,174 | 28,584
Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 27,564 | 26,125
Accumulated Depreciation | (6,758) | (6,148)
Properties - Net | 20,806 | 19,977
Road - Rail and Other Track Material [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 7,150 | 6,771
Accumulated Depreciation | (1,414) | (1,400)
Properties - Net | $ 5,736 | $ 5,371
Annual Depreciation Rate | 2.50% | 2.50%
Depreciation Method |  | Group Life
Road - Ties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 5,077 | $ 4,807
Accumulated Depreciation | (1,147) | (1,060)
Properties - Net | $ 3,930 | $ 3,747
Annual Depreciation Rate | 3.70% | 3.70%
Depreciation Method |  | Group Life
Road - Grading [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,533 | $ 2,460
Accumulated Depreciation | (479) | (481)
Properties - Net | $ 2,054 | $ 1,979
Annual Depreciation Rate | 1.40% | 1.40%
Depreciation Method |  | Group Life
Road - Ballast [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,793 | $ 2,693
Accumulated Depreciation | (802) | (679)
Properties - Net | $ 1,991 | $ 2,014
Annual Depreciation Rate | 2.70% | 2.70%
Depreciation Method |  | Group Life
Road - Bridges, Trestles, and Culverts [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,238 | $ 2,119
Accumulated Depreciation | (283) | (278)
Properties - Net | $ 1,955 | $ 1,841
Annual Depreciation Rate | 1.60% | 1.60%
Depreciation Method |  | Group Life
Road - Signals and Interlockers [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,315 | $ 2,103
Accumulated Depreciation | (416) | (356)
Properties - Net | $ 1,899 | $ 1,747
Annual Depreciation Rate | 4.00% | 4.00%
Depreciation Method |  | Group Life
Road - Buildings [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,152 | $ 1,102
Accumulated Depreciation | (424) | (377)
Properties - Net | $ 728 | $ 725
Annual Depreciation Rate | 2.50% | 2.50%
Depreciation Method |  | Group Life
Road - Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 4,306 | $ 4,070
Accumulated Depreciation | (1,793) | (1,517)
Properties - Net | $ 2,513 | $ 2,553
Annual Depreciation Rate | 4.20% | 4.20%
Depreciation Method |  | Group Life
Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 11,108 | $ 10,108
Accumulated Depreciation | (4,633) | (4,526)
Properties - Net | 6,475 | 5,582
Equipment - Locomotive [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 5,673 | 5,036
Accumulated Depreciation | (2,461) | (2,325)
Properties - Net | $ 3,212 | $ 2,711
Annual Depreciation Rate | 3.60% | 3.60%
Depreciation Method |  | Group Life
Equipment - Freight Cars [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 3,362 | $ 3,244
Accumulated Depreciation | (1,018) | (1,169)
Properties - Net | $ 2,344 | $ 2,075
Annual Depreciation Rate | 3.20% | 3.20%
Depreciation Method |  | Group Life
Equipment - Work Equipment and Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 2,073 | $ 1,828
Accumulated Depreciation | (1,154) | (1,032)
Properties - Net | $ 919 | $ 796
Annual Depreciation Rate | 7.10% | 7.10%
Depreciation Method |  | Group Life
Land [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | $ 1,858 | $ 1,875
Properties - Net | 1,858 | 1,875
Construction in Progress [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 1,003 | 1,196
Properties - Net | 1,003 | 1,196
Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Cost | 41 | 39
Accumulated Depreciation | (9) | (85)
Properties - Net | $ 32 | $ (46)
Depreciation Method |  | Straight Line
Minimum [Member] | Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 8 years | 8 years
Minimum [Member] | Road - Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 8 years |
Minimum [Member] | Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 3 years | 3 years
Minimum [Member] | Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 4 years | 4 years
Maximum [Member] | Road - Total [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 90 years | 90 years
Maximum [Member] | Road - Grading [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 90 years |
Maximum [Member] | Total Equipment [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 38 years | 38 years
Maximum [Member] | Equipment - Work Equipment and Other [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 38 years |
Maximum [Member] | Other properties [Member] |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Estimated useful life | 30 years | 30 years

X
- 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 of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the methodology for computing depreciation for classes of depreciable assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + 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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