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Accrued maintenance liability (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Movement in Accrued Maintenance Liability [Roll Forward] |  |
Accrued maintenance liability at beginning of period | $ 2,237,494 | $ 2,461,799
Maintenance payments received | 736,423 | 743,256
Maintenance payments returned | (352,032) | (459,326)
Release to income other than upon sale | (207,849) | (228,081)
Lessor contribution, top ups and other | 25,310 | (18,914)
Accrued maintenance liability at end of period | $ 2,190,159 | $ 2,237,494

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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 And Top Ups + References 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 + 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 Or Released To Income + References No definition available. + Details
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 + 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 Movement in Accrued Maintenance Liability + References No definition available. + Details
Name: | aer_MovementinAccruedMaintenanceLiabilityRollForward
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration