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Allowance for credit losses - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Allowance For Credit Loss [Line Items] |  |
Increase in allowance for credit loss | $ (1,000) |
Write-offs charged against the allowance | $ 36,883 | $ 68,171
Ukraine conflict |  |
Allowance For Credit Loss [Line Items] |  |
Increase in allowance for credit loss |  | $ 75,800

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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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- Definition Allowance for Credit Loss, Writeoff + References No definition available. + Details
Name: | aer_AllowanceForCreditLossWriteoff
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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