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Allowance for credit losses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 0 |
Cumulative effect due to adoption of new accounting standard | 67,153 |
Current period provision for expected credit losses | 50,215 |
Write-offs charged against the allowance | (13,326) |
Allowance for credit losses at end of period | 67,153 |
Cumulative effect due to adoption of new accounting standard |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 30,264 |
Cumulative effect due to adoption of new accounting standard | $ 30,264 | $ 30,300

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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: |