Amount of cash distribution paid to unit-holder of limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_DistributionMadeToLimitedPartnerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of equity impact of enhanced cash distribution declared to unit-holder of limited partnership (LP).

+ References

No definition available.

+ Details

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Namespace Prefix:	wes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per unit of ownership amount of enhanced cash distributions declared to unit-holder of a limited partnership (LP).

+ References

No definition available.

+ Details

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Namespace Prefix:	wes_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of days subsequent to each quarter the Partnership is required to make distributions to unitholders of record on the applicable record date.

+ References

No definition available.

+ Details

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Namespace Prefix:	wes_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=wes_WesternMidstreamPartnersLPMember
Namespace Prefix:
Data Type:	na
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- Details

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Partnership Distributions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Distribution Made to Limited Partner [Line Items]
Enhanced quarterly per-unit distribution	$ 0.356
Enhanced quarterly cash distribution	$ 140.1
WES [Member]
Distribution Made to Limited Partner [Line Items]
Partnership agreement day requirement of distribution of available cash		55 days
WES Operating [Member]
Distribution Made to Limited Partner [Line Items]
Additional quarterly cash distribution		$ 130.1	$ 463.8