Debt (Narrative) (Details)	1 Months Ended	6 Months Ended
Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Line of Credit \| ABL Facility
Debt Instrument
Maximum borrowing capacity	$ 4,250,000,000	$ 4,250,000,000
Minimum available borrowing capacity, percentage		10.00%
Uncommitted Repurchase Facility
Debt Instrument
Maximum borrowing capacity	$ 100,000,000	$ 100,000,000
Debt instrument, term	1 month

Debt Instrument, Covenant Terms, Fixed Charge Coverage Ratio Threshold, Minimum Available Borrowing Capacity, Percentage

No definition available.

+ Details

Name:	uri_DebtInstrumentCovenantTermsFixedChargeCoverageRatioThresholdMinimumAvailableBorrowingCapacityPercentage
Namespace Prefix:	uri_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=uri_AblFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=uri_UncommittedRepurchaseFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: