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Intangibles (Maintenance rights and lease premium, net) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Maintenance rights | $ 3,292,007 | $ 642,825
Lease premium, net | 1,152,513 | 7,089
Maintenance rights and lease premium, net | $ 4,444,520 | $ 649,914

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- Definition Lease Premium + References No definition available. + Details
Name: | aer_LeasePremium
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maintenance Rights + References No definition available. + Details
Name: | aer_MaintenanceRights
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maintenance Rights And Lease Premium, Net + References No definition available. + Details
Name: | aer_MaintenanceRightsAndLeasePremiumNet
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration