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Allowance for credit losses (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
COVID-19 Pandemic |
Allowance For Credit Loss [Line Items] |
Increase in allowance for credit loss | $ 50.2

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- Definition Allowance For Credit Loss + References No definition available. + Details
Name: | aer_AllowanceForCreditLossLineItems
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for Credit Loss, Period Increase (Decrease) + References No definition available. + Details
Name: | aer_AllowanceForCreditLossPeriodIncreaseDecrease
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=aer_COVID19PandemicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |