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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
Federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Unrecognized tax benefits, interest on income taxes expense (less than $1 for December 31, 2014, 2013, and 2012 respectively) $ 1,000,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense $ 1,000,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense $ 1,000,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Income before income taxes, foreign 168,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 153,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 144,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Undistributed earnings of foreign subsidiaries amount 595,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Operating loss carryforwards, benefit 71,000,000uri_OperatingLossCarryforwardsUtilizedDuringPeriodAmount    
State Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carryforwards, state and local 915,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Valuation allowance, amount (less than $1 for December 31, 2014 and 2013 respectively) 1,000,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 1,000,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carryforwards, state and local 463,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Alternative minimum tax credit carryforward, amount 29,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Tax Year, 2014 | Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carryforwards, state and local $ 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxPeriodAxis
= uri_TaxYear2014Member