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Accrued maintenance liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Movement in Accrued Maintenance Liability [Roll Forward]
Accrued maintenance liability at beginning of period	$ 2,750,576	$ 3,185,794
Maintenance payments received	756,314	794,711
Maintenance payments returned	(523,403)	(505,407)
Release to income upon sale	(275,360)	(341,161)
Release to income other than upon sale	(302,408)	(421,332)
Lessor contribution, top ups and other	42,379	8,315
Interest accretion	13,701	26,563
Additions due to aircraft acquisitions	0	3,093
Accrued maintenance liability at end of period	$ 2,461,799	$ 2,750,576

X

- 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

X

- Definition

Accrued Maintenance Liability Additions Due To Acquisitions

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No definition available.

+ Details

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

X

- Definition

Accrued Maintenance Liability, Interest Accretion

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No definition available.

+ Details

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

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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

X

- 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

X

- Definition

Accrued Maintenance Liability, Release To Income Upon Sale

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No definition available.

+ Details

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

X

- 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