XML 70 R53.htm IDEA: XBRL DOCUMENT
v3.20.1

Properties (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 74,658 | $ 74,246
Accumulated depreciation |  | 20,537 | 20,330
Net book value |  | 54,121 | 53,916
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 5,275 | 5,276
Net book value |  | 5,275 | 5,276
Road: Rail and Other Track Material [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 17,288 | 17,178
Accumulated depreciation |  | 6,440 | 6,381
Net book value |  | $ 10,848 | $ 10,797
Estimated useful life |  | 42 years | 42 years
Road: Ties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 10,793 | $ 10,693
Accumulated depreciation |  | 3,230 | 3,186
Net book value |  | $ 7,563 | $ 7,507
Estimated useful life |  | 34 years | 34 years
Road: Ballast [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 5,798 | $ 5,752
Accumulated depreciation |  | 1,687 | 1,669
Net book value |  | $ 4,111 | $ 4,083
Estimated useful life |  | 34 years | 34 years
Road: Other Roadway [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost | [1] | $ 20,486 | $ 20,331
Accumulated depreciation | [1] | 4,124 | 4,056
Net book value | [1] | $ 16,362 | $ 16,275
Estimated useful life | [1] | 48 years | 48 years
Total Road [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 54,365 | $ 53,954
Accumulated depreciation |  | 15,481 | 15,292
Net book value |  | 38,884 | 38,662
Equipment: Locomotives [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 9,456 | 9,467
Accumulated depreciation |  | 3,453 | 3,434
Net book value |  | $ 6,003 | $ 6,033
Estimated useful life |  | 18 years | 18 years
Equipment: Freight Cars [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 2,089 | $ 2,083
Accumulated depreciation |  | 783 | 779
Net book value |  | $ 1,306 | $ 1,304
Estimated useful life |  | 24 years | 25 years
Equipment: Work Equipment and Other [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 1,094 | $ 1,081
Accumulated depreciation |  | 330 | 322
Net book value |  | $ 764 | $ 759
Estimated useful life |  | 18 years | 18 years
Total Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 12,639 | $ 12,631
Accumulated depreciation |  | 4,566 | 4,535
Net book value |  | 8,073 | 8,096
Technology and Other [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | 1,193 | 1,136
Accumulated depreciation |  | 490 | 503
Net book value |  | $ 703 | $ 633
Estimated useful life |  | 12 years | 12 years
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost |  | $ 1,186 | $ 1,249
Net book value |  | $ 1,186 | $ 1,249
[1] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://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(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: 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
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadrailAndOtherTrackMaterialMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadTiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadBallastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_EquipmentLocomotivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_EquipmentFreightCarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_EquipmentWorkEquipmentAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_TechnologyEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |