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Income Taxes (Components of income tax expense and reconciliation of effective tax rate) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current      
Federal $ 2us-gaap_CurrentFederalTaxExpenseBenefit $ 10us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
Foreign 42us-gaap_CurrentForeignTaxExpenseBenefit 39us-gaap_CurrentForeignTaxExpenseBenefit 27us-gaap_CurrentForeignTaxExpenseBenefit
State and local 5us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense 49us-gaap_CurrentIncomeTaxExpenseBenefit 51us-gaap_CurrentIncomeTaxExpenseBenefit 29us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred      
Federal 240us-gaap_DeferredFederalIncomeTaxExpenseBenefit 149us-gaap_DeferredFederalIncomeTaxExpenseBenefit (22)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign 2us-gaap_DeferredForeignIncomeTaxExpenseBenefit 4us-gaap_DeferredForeignIncomeTaxExpenseBenefit 2us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local 19us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 14us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 4us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 261us-gaap_DeferredIncomeTaxExpenseBenefit 167us-gaap_DeferredIncomeTaxExpenseBenefit (16)us-gaap_DeferredIncomeTaxExpenseBenefit
Total 310us-gaap_IncomeTaxExpenseBenefit 218us-gaap_IncomeTaxExpenseBenefit 13us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed tax at statutory tax rate 297us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 212us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 31us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit 22us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes [1] 15us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes [1] 5us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes [1]
Non-deductible expenses and other 8us-gaap_IncomeTaxReconciliationNondeductibleExpense [2] 8us-gaap_IncomeTaxReconciliationNondeductibleExpense [2] (8)us-gaap_IncomeTaxReconciliationNondeductibleExpense [2]
Foreign taxes (17)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (17)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (15)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Income tax reconciliation, nondeductible expense, transfer price benefit     2uri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransferPricingTaxBenefit
RSC      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax reconciliation, acquisition related expense     8uri_EffectiveIncomeTaxRateReconciliationStateIncomeTaxesAcquisitionRelatedExpense
/ us-gaap_BusinessAcquisitionAxis
= uri_RscHoldingsIncMember
Canada Revenue Agency      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax reconciliation, nondeductible expense, foreign tax benefits     $ 6uri_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseForeignTaxBenefitAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_CanadaRevenueAgencyMember
[1] 2012 state income taxes, net of federal tax benefit includes $8 of expense primarily related to the write-off of certain state deferred tax assets as a result of the RSC acquisition.
[2] 2012 non-deductible expenses and other includes a $6 Canadian tax benefit due to settlements with the Canadian Revenue Authority and a $2 transfer pricing tax benefit.