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Accrued maintenance liability (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Maintenance Liability [Roll Forward] |  |
Accrued maintenance liability at beginning of period | $ 2,503,202 | $ 2,900,651
Maintenance payments received | 378,292 | 353,522
Maintenance payments returned | (109,522) | (172,570)
Release to income other than upon sale | (145,006) | (698,429)
Lessor contribution , top-ups and other | 6,559 | (53,627)
Accrued maintenance liability at end of period | 2,567,107 | 2,315,468
Non-cash investing and financing activities |  |
Maintenance Liability [Roll Forward] |  |
Release to income upon sale | $ (66,418) | $ (14,079)

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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. + References 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 + References 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 + References No definition available. + Details
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 + References No definition available. + Details
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 + References No definition available. + Details
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 + References No definition available. + Details
Name: | aer_AccruedMaintenanceLiabilityReleaseToIncomeUponSale
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maintenance Liability + References No definition available. + Details
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: |