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Intangibles (Movements in maintenance rights) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights at beginning of period | $ 794,798 |
Maintenance rights at end of period | 642,825 | $ 794,798
Maintenance Rights |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights at beginning of period | 794,798 | 1,088,246
EOL and MR contract maintenance rights expense | (45,655) | (76,611)
MR contract maintenance rights write-off due to maintenance liability release | (35,897) | (19,848)
EOL contract maintenance rights write-off due to cash receipt | (51,463) | (148,289)
EOL and MR contract maintenance rights write-off due to sale of aircraft and impairment | (18,958) | (48,700)
Maintenance rights at end of period | $ 642,825 | $ 794,798

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
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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
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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_FiniteLivedIntangibleAssetsEndOfLeaseContractCashReceipt
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
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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 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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |