Represents information related to agreements.

No definition available.

Name:	am_Agreements
Namespace Prefix:	am_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The compression agreement number of dedicated areas.

+ References

No definition available.

+ Details

Name:	am_CompressionAgreementNumberOfDedicatedAreas
Namespace Prefix:	am_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The period prior to which notice to be served for the termination of the contract.

+ References

No definition available.

+ Details

Name:	am_MinimumNoticePeriodForTerminationOfContract
Namespace Prefix:	am_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rebate issued based on volumetric targets achieved.

+ References

No definition available.

+ Details

Name:	am_RebateIssued
Namespace Prefix:	am_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents percentage of third party out of pocket cost reimbursement markup.

+ References

No definition available.

+ Details

Name:	am_ThirdPartyOutOfPocketCostsReimbursementPercentage
Namespace Prefix:	am_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

+ Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=am_GatheringAndCompressionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=am_UticaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=am_WaterServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue (Details) $ in Millions	12 Months Ended
Revenue (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2019 area
Gathering And Compression Agreement
Agreements
Notice period	180 days
Rebate issued		$ 52	$ 48
Gathering And Compression Agreement \| Utica
Agreements
Number of dedicated areas \| area				2
Water Handling Agreement
Agreements
Notice period	180 days
Third party out of pocket costs reimbursement markup (as a percent)	3.00%
Minimum future revenues for cost of services	$ 34