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(Maintenance rights and lease premium, net) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Maintenance rights | $ 794,798 | $ 1,088,246
Lease premium, net | 14,817 | 24,944
Maintenance rights and lease premium, net | $ 809,615 | $ 1,113,190

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

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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

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