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Fair Value Measurements (Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Level 1 [Member] | Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior and senior subordinated notes 6,063us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Level 1 [Member] | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior and senior subordinated notes 6,390us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 5,848us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Level 2 [Member] | Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
4 percent Convertible Senior Notes 32us-gaap_ConvertibleDebtFairValueDisclosures
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Level 2 [Member] | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
4 percent Convertible Senior Notes 33us-gaap_ConvertibleDebtFairValueDisclosures
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Level 3 | Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Capital leases 105us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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Level 3 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Capital leases 104us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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4 percent Convertible Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= uri_ConvertibleNotes4PercentMember		 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= uri_ConvertibleNotes4PercentMember		 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Effective interest rate 7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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= uri_ConvertibleNotes4PercentMember		    
Capital leases      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Effective interest rate 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember		    
[1] The fair value of the 4 percent Convertible Senior Notes is based on the market value of comparable notes. Consistent with the carrying amount, the fair value excludes the equity component of the notes. To exclude the equity component and calculate the fair value, we used an effective interest rate of 7.3 percent. As discussed below (see note 12), the total cost to settle the notes based on the closing price of our common stock on December 31, 2014 would be $310.
[2] The fair value of capital leases reflects the present value of the leases using a 7.0 percent interest rate.