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Other income - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Component of Operating Income [Abstract] |  |  |  |
Proceeds from unsecured claims | $ 1,329 | $ 39,352 | $ 2,913 | $ 39,352

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- Definition Other Income, Restructuring Claims + References No definition available. + Details
Name: | aer_OtherIncomeRestructuringClaims
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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