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Accrued maintenance liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Movement in Accrued Maintenance Liability [Roll Forward]
Accrued maintenance liability at beginning of period	$ 2,190,159	$ 2,237,494
Maintenance payments received	345,699	736,423
Maintenance payments returned	(412,492)	(352,032)
Release to income other than upon sale	(344,210)	(207,849)
Lessor contribution, top ups and other	66,281	25,310
Accrued maintenance liability at end of period	$ 1,750,395	$ 2,190,159

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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

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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.

+ 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

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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

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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

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No definition available.

+ Details

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