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Summary of Significant Accounting Policies (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 01, 2013
reporting_unit
Dec. 31, 2014
Dec. 31, 2013
reporting_unit
Dec. 31, 2012
Oct. 01, 2014
Apr. 30, 2014
entity
Significant Accounting Policies [Line Items]            
Cost of service and other revenues   $ 32,000,000us-gaap_CostOfServicesMaintenanceCosts $ 25,000,000us-gaap_CostOfServicesMaintenanceCosts $ 29,000,000us-gaap_CostOfServicesMaintenanceCosts    
Number of reporting units evaluated for impairment 10us-gaap_NumberOfReportingUnits          
Goodwill 2,300,000,000uri_GoodwillIndividuallyEvaluatedforImpairmentAmount          
Number of reporting units impacted by internal reporting changes evaluated for impairment     4uri_NumberofReportingUnitsImpactedbyInternalReportingChangesIndividuallyEvaluatedforImpairment      
Goodwill, impairment testing, change in reporting structure, amount 626,000,000uri_GoodwillImpairmentTestingRegionsAffectedbyChangeinReportingStructureAmount          
Percentage of fair value in excess of carrying amount 44.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount       63.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount  
Deferred revenue   36,000,000us-gaap_DeferredRevenue 30,000,000us-gaap_DeferredRevenue      
Advertising expense   0us-gaap_AdvertisingExpense 0us-gaap_AdvertisingExpense 0us-gaap_AdvertisingExpense    
Advertising reimbursements   16,000,000us-gaap_CooperativeAdvertisingAmount 15,000,000us-gaap_CooperativeAdvertisingAmount 13,000,000us-gaap_CooperativeAdvertisingAmount    
Insurance deductible, per occurrence, general liability   2,000,000uri_InsuranceDeductibleAmountPerOccurrenceGeneralLiability 2,000,000uri_InsuranceDeductibleAmountPerOccurrenceGeneralLiability      
Insurance deductible, per occurrence, workers' compensation   1,000,000uri_InsuranceDeductibleAmountPerOccurrenceWorkersCompensation 1,000,000uri_InsuranceDeductibleAmountPerOccurrenceWorkersCompensation      
Insurance deductible, per occurrence, automobile liability   2,000,000uri_InsuranceDeductibleAmountPerOccurrenceAutomobileLiability 2,000,000uri_InsuranceDeductibleAmountPerOccurrenceAutomobileLiability      
Insurance stop loss limit, self insured events   700,000uri_SelfInsuranceStopLossLimitperOccurrence        
Accounts receivable | Customer concentration risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage (less than 1% of total revenues)   1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
     
Trade names and trademarks            
Significant Accounting Policies [Line Items]            
Finite lived intangible assets life   5 years        
Rental Equipment            
Significant Accounting Policies [Line Items]            
PP&E additions   39,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
44,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
24,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
   
Cost of service and other revenues   $ 604,000,000us-gaap_CostOfServicesMaintenanceCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
$ 563,000,000us-gaap_CostOfServicesMaintenanceCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
$ 455,000,000us-gaap_CostOfServicesMaintenanceCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
   
Minimum | Customer relationships            
Significant Accounting Policies [Line Items]            
Finite lived intangible assets life   7 years        
Minimum | Rental Equipment            
Significant Accounting Policies [Line Items]            
PP&E useful life   2 years        
PP&E salvage value   0.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Minimum | Property and Equipment            
Significant Accounting Policies [Line Items]            
PP&E useful life   2 years        
Maximum | Revenues | Customer concentration risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage (less than 1% of total revenues)     1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum | Non-compete agreements            
Significant Accounting Policies [Line Items]            
Finite lived intangible assets life   5 years        
Maximum | Customer relationships            
Significant Accounting Policies [Line Items]            
Finite lived intangible assets life   15 years        
Maximum | Rental Equipment            
Significant Accounting Policies [Line Items]            
PP&E useful life   12 years        
PP&E salvage value   10.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentLeasedToOtherPartyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Maximum | Property and Equipment            
Significant Accounting Policies [Line Items]            
PP&E useful life   39 years        
Largest customer | Maximum | Revenues | Customer concentration risk            
Significant Accounting Policies [Line Items]            
Concentration risk, percentage (less than 1% of total revenues)   1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= uri_LargestCustomerMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
National Pump            
Significant Accounting Policies [Line Items]            
Percentage of fair value in excess of carrying amount         13.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember
 
Number of entities acquired as part of business acquisition           4uri_NumberofEntitiesAcquiredasPartofBusinessAcquisition
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember