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v3.21.2

Allowance for credit losses (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 67,153 | $ 0
Current period provision for expected credit losses | 16,954 | 33,999
Write-offs charged against the allowance | 0 | 0
Allowance for credit losses at end of period | 84,107 | 64,263
Cumulative effect due to adoption of new accounting standard |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 0 | $ 30,264

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- Definition Allowance for Credit Loss + References No definition available. + Details
Name: | aer_AllowanceForCreditLoss
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Credit Loss + References No definition available. + Details
Name: | aer_AllowanceForCreditLossRollForward
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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- Definition Credit Loss Expense (Reversal) + References No definition available. + Details
Name: | aer_CreditLossExpenseReversal
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |