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Intangibles - Maintenance rights and lease premium, net (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Maintenance rights | $ 610,252 | $ 642,825
Lease premium, net | 3,919 | 7,089
Maintenance rights and lease premium, net | $ 614,171 | $ 649,914

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