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Accrued maintenance liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accrued Maintenance [Roll Forward]
Accrued maintenance liability at beginning of period	$ 2,863,730	$ 2,503,202
Maintenance payments received	920,932	817,229
Maintenance payments returned	(248,017)	(201,474)
Release to income other than upon sale	(163,405)	(203,440)
Lessor contribution, top ups and other	(14,135)	36,022
Accrued maintenance liability at end of period	3,327,347	2,863,730	$ 2,503,202
Non-cash Investing and Financing Activities
Accrued Maintenance [Roll Forward]
Release to income upon sale	$ (31,758)	$ (87,809)	$ (72,000)

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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.

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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 And Top Ups

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No definition available.

+ Details

Name:	aer_AccruedMaintenanceLiabilityLessorContributionAndTopUps
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 Or Released To Income

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No definition available.

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Name:	aer_AccruedMaintenanceLiabilityMaintenancePaymentsReimbursedOrReleasedToIncome
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

Accrued Maintenance

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No definition available.

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Name:	aer_AccruedMaintenanceRollForward
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: