Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Jan. 27, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-14387
Entity Registrant Name	United Rentals, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-1522496
Entity Address, Address Line One	100 First Stamford Place, Suite 700
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	203
Local Phone Number	622-3131
Title of 12(b) Security	Common Stock, $.01 par value, of United Rentals, Inc.
Trading Symbol	URI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 37.8
Entity Common Stock, Shares Outstanding		65,307,098
Documents Incorporated by Reference	Portions of United Rentals, Inc.’s Proxy Statement related to the 2025 Annual Meeting of Stockholders are incorporated by reference into Part III of this annual report.
Entity Central Index Key	0001067701
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false