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Accrued maintenance liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Maintenance Liability [Roll Forward]
Accrued maintenance liability at beginning of period	$ 3,327,347	$ 2,863,730
Maintenance payments received	462,937	442,130
Maintenance payments returned	(81,268)	(178,364)
Release to income other than upon sale	(76,389)	(112,413)
Lessor contribution, top-ups and other	(73,104)	(33,048)
Accrued maintenance liability at end of period	3,468,886	2,979,269
Non-cash investing and financing activities
Maintenance Liability [Roll Forward]
Release to income upon sale	$ (90,637)	$ (2,766)

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- Definition

Obligation towards lessees for the periodic payments received from the lessee of supplemental maintenance rent which is calculated with reference to the utilization of airframes, engines and other major life-limited components during the lease.

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No definition available.

+ Details

Name:	aer_AccruedMaintenanceLiability
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Accrued Maintenance Liability, Lessor Contribution, Top Ups And Other

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No definition available.

+ Details

Name:	aer_AccruedMaintenanceLiabilityLessorContributionTopUpsAndOther
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Accrued Maintenance Liability, Maintenance Payments Received

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No definition available.

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Name:	aer_AccruedMaintenanceLiabilityMaintenancePaymentsReceived
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Accrued Maintenance Liability, Maintenance Payments Reimbursed

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No definition available.

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Name:	aer_AccruedMaintenanceLiabilityMaintenancePaymentsReimbursed
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Accrued Maintenance Liability, Release To Income Upon Redelivery Or Termination

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No definition available.

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Name:	aer_AccruedMaintenanceLiabilityReleaseToIncomeUponRedeliveryOrTermination
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Accrued Maintenance Liability, Release To Income Upon Sale

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No definition available.

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Name:	aer_AccruedMaintenanceLiabilityReleaseToIncomeUponSale
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Maintenance Liability

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No definition available.

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Name:	aer_MaintenanceLiabilityRollForward
Namespace Prefix:	aer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis=aer_NonCashInvestingAndFinancingActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: