v3.25.4

Maintenance rights and lease premium, net - Schedule of Movements in Maintenance Rights (Details) - Maintenance Rights - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights at beginning of period | $ 1,669,742 | $ 2,099,513
EOL and MR contract maintenance rights expense | (71,103) | (144,726)
MR contract maintenance rights write-off due to maintenance liability release | (19,544) | (38,525)
EOL contract maintenance rights write-off due to cash receipt | (67,412) | (159,682)
EOL and MR contract maintenance rights write-off due to sale of aircraft | (175,243) | (86,838)
Maintenance rights at end of period | $ 1,336,440 | $ 1,669,742

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_FiniteLivedIntangibleAssetsMaintenanceReservedContractRightsExpenseOffsetByMaintenanceLiabilityRelease
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: |