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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts Payable
Basis of Presentation
Book overdrafts	$ 20	$ 14
Revenue distributions payable
Basis of Presentation
Book overdrafts	$ 20	$ 17

X

- Definition

Carrying value as of the balance sheet date of outstanding checks in excess of the bank balance that have not yet been cashed.

+ References

No definition available.

+ Details

Name:	ar_BookOverdrafts
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ar_RevenueDistributionsPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: