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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Variable Interest Entities [Abstract] |  |
Carrying value of debt and equity investments and maximum exposure to loss | $ 129,512 | $ 125,955

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- Definition Variable Interest Entities [Abstract] + References No definition available. + Details
Name: | aer_VariableInterestEntitiesAbstract
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity, Entity Maximum Loss Exposure, Equity Investment and Cost Method Investment Amount + References No definition available. + Details
Name: | aer_VariableInterestEntityEntityMaximumLossExposureEquityInvestmentandCostMethodInvestmentAmount
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant