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Intangibles - Movements in maintenance rights (Details) - Maintenance Rights - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights at beginning of period | $ 2,540,286 | $ 3,292,007
EOL and MR contract maintenance rights expense | (140,686) | (166,512)
MR contract maintenance rights write-off offset by maintenance liability release | (16,594) | (242,142)
EOL contract maintenance rights write-off due to cash received | (57,541) | (65,506)
EOL and MR contract maintenance rights write-off due to sale of aircraft | (70,505) | (2,333)
Maintenance rights at end of period | $ 2,254,960 | $ 2,815,514

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract intangible write off due to sale of aircraft. + References No definition available. + Details
Name: | aer_FiniteLivedIntangibleAssetsEndOfLeaseAndMaintenanceReservedContractIntangibleWriteOffDueToSaleOfAircraft
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract maintenance rights expense. + References No definition available. + Details
Name: | aer_FiniteLivedIntangibleAssetsEndOfLeaseAndMaintenanceReservedContractRightsExpense
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for maintenance reserve (MR) contract maintenance rights write off due to maintenance liability release. + References No definition available. + Details
Name: | aer_FiniteLivedIntangibleAssetsMaintenanceReserveContractRightsExpenseOffsetByMaintenanceLiabilityRelease
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) contract cash receipt. + References No definition available. + Details
Name: | aer_FiniteLivedIntangibleAssetsWriteOffOffsetByEndOfLeaseContractCompensationReceived
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=aer_MaintenanceRightsIntangibleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |