XML 105 R81.htm IDEA: XBRL DOCUMENT v3.25.0.1

Properties - Schedule of Property and Equipment and Weighted Average Estimated Useful Life (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Cost		$ 81,733,000,000		$ 83,840,000,000
Accumulated Depreciation		24,335,000,000		25,497,000,000
Net Book Value		57,398,000,000		58,343,000,000
Gain recognized in other expense		0	$ 0
Land
Property, Plant and Equipment [Line Items]
Cost		5,426,000,000		5,441,000,000
Net Book Value		5,426,000,000		5,441,000,000
Total road
Property, Plant and Equipment [Line Items]
Cost		60,342,000,000		62,049,000,000
Accumulated Depreciation		18,668,000,000		19,614,000,000
Net Book Value		41,674,000,000		42,435,000,000
Rail and other track material
Property, Plant and Equipment [Line Items]
Cost		18,837,000,000		19,283,000,000
Accumulated Depreciation		7,344,000,000		7,642,000,000
Net Book Value		$ 11,493,000,000		$ 11,641,000,000
Estimated Useful Life		42 years		46 years
Ties
Property, Plant and Equipment [Line Items]
Cost		$ 11,985,000,000		$ 12,358,000,000
Accumulated Depreciation		3,895,000,000		4,109,000,000
Net Book Value		$ 8,090,000,000		$ 8,249,000,000
Estimated Useful Life		34 years		34 years
Ballast
Property, Plant and Equipment [Line Items]
Cost		$ 6,345,000,000		$ 6,495,000,000
Accumulated Depreciation		2,061,000,000		2,182,000,000
Net Book Value		$ 4,284,000,000		$ 4,313,000,000
Estimated Useful Life		34 years		34 years
Other roadway
Property, Plant and Equipment [Line Items]
Cost		$ 23,175,000,000		$ 23,913,000,000
Accumulated Depreciation		5,368,000,000		5,681,000,000
Net Book Value		$ 17,807,000,000		$ 18,232,000,000
Estimated Useful Life		47 years		47 years
Total equipment
Property, Plant and Equipment [Line Items]
Cost		$ 13,404,000,000		$ 13,750,000,000
Accumulated Depreciation		5,093,000,000		5,243,000,000
Net Book Value		8,311,000,000		8,507,000,000
Locomotives
Property, Plant and Equipment [Line Items]
Cost		9,295,000,000		9,517,000,000
Accumulated Depreciation		3,591,000,000		3,724,000,000
Net Book Value		$ 5,704,000,000		$ 5,793,000,000
Estimated Useful Life		18 years		18 years
Freight cars
Property, Plant and Equipment [Line Items]
Cost		$ 2,765,000,000		$ 3,011,000,000
Accumulated Depreciation		956,000,000		1,037,000,000
Net Book Value		$ 1,809,000,000		$ 1,974,000,000
Estimated Useful Life		23 years		22 years
Work equipment and other
Property, Plant and Equipment [Line Items]
Cost		$ 1,344,000,000		$ 1,222,000,000
Accumulated Depreciation		546,000,000		482,000,000
Net Book Value		$ 798,000,000		$ 740,000,000
Estimated Useful Life		17 years		17 years
Technology and other
Property, Plant and Equipment [Line Items]
Cost		$ 1,388,000,000		$ 1,431,000,000
Accumulated Depreciation		574,000,000		640,000,000
Net Book Value		$ 814,000,000		$ 791,000,000
Estimated Useful Life		12 years		12 years
Construction in progress
Property, Plant and Equipment [Line Items]
Cost		$ 1,173,000,000		$ 1,169,000,000
Accumulated Depreciation		0		0
Net Book Value		$ 1,173,000,000		$ 1,169,000,000
Chassis Assets | Other Expense
Property, Plant and Equipment [Line Items]
Gain recognized in other expense	$ 46,000,000

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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:	instant

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_RoadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_RoadrailAndOtherTrackMaterialMember
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=us-gaap_EquipmentMember
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_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:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=unp_ChassisAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: