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(Maintenance rights and lease premium, net) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Maintenance rights | $ 642,825 | $ 794,798
Lease premium, net | 7,089 | 14,817
Maintenance rights and lease premium, net | $ 649,914 | $ 809,615

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

X
- 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

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