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Common Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 21, 2015
Apr. 30, 2014
Nov. 30, 2009
Class of Stock [Line Items]            
Common stock, shares authorized 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized        
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare        
4 percent Convertible Senior Notes            
Class of Stock [Line Items]            
Common stock, capital shares reserved for future issuance 3,800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
17,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
       
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
     
Debt instrument, convertible, conversion price $ 11.11us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
         
Restricted Stock Units (RSUs)            
Class of Stock [Line Items]            
Restricted stock units outstanding (in shares) 1,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Restricted stock units outstanding 702,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
763,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Share conversion ratio 1uri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsShareConversionRatio
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Shares issued for RSUs 396,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Shares paid for tax withholding 227,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Compensation expense not yet recognized $ 29us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Compensation expense not yet recognized, period for recognition 1 year 9 months 18 days          
Fair value of RSUs vested during the period 54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Time-based Restricted Stock Units            
Class of Stock [Line Items]            
Vesting period 3 years          
Vesting period, start duration from grant date 12 months          
Employee stock option            
Class of Stock [Line Items]            
Common stock, capital shares reserved for future issuance 700,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
900,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
2010 Long Term Incentive Plan            
Class of Stock [Line Items]            
Number of shares available for grant 3,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= uri_LongTermIncentivePlan2010Member
         
Convertible debt | 4 percent Convertible Senior Notes            
Class of Stock [Line Items]            
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
    4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Debt instrument, convertible, conversion price $ 11.11us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
         
Subsequent event | Convertible debt | 4 percent Convertible Senior Notes            
Class of Stock [Line Items]            
Redemption notice amount       26uri_DebtInstrumentConvertibleRedemptionNoticeAmount
/ us-gaap_DebtInstrumentAxis
= uri_ConvertibleNotes4PercentMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
National Pump            
Class of Stock [Line Items]            
Value of stock issued in connection with business acquisition         15us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember
 
National Pump | Restricted Stock Units (RSUs)            
Class of Stock [Line Items]            
Vesting period         3 years  
Expense recorded during period related to stock awards $ 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember