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Acquisitions (Acquired Intangible Assets) (Details) (National Pump, USD $)
In Millions, unless otherwise specified
 1 Months Ended
Apr. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair value $ 289us-gaap_FinitelivedIntangibleAssetsAcquired1
Customer relationships
  
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair value 274us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Life (years) 10 years
Non-compete agreements
  
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair value $ 15us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= uri_NationalPumpMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Life (years) 6 years