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(Maintenance rights and lease premium, net) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Maintenance rights	$ 1,088,246	$ 1,464,599
Lease premium, net	24,944	37,259
Maintenance rights and lease premium, net	$ 1,113,190	$ 1,501,858

X

- Definition

Lease Premium

+ References

No definition available.

+ Details

Name:	aer_LeasePremium
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maintenance Rights Intangible

+ References

No definition available.

+ Details

Name:	aer_MaintenanceRightsIntangible
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maintenance Rights Intangible And Lease Premium, Net

+ References

No definition available.

+ Details

Name:	aer_MaintenanceRightsIntangibleAndLeasePremiumNet
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration