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Allowance for credit losses (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 117,547 | $ 67,153
Current period provision for expected credit losses | 75,771 | 16,954
Write-offs charged against the allowance | (68,171) | 0
Allowance for credit losses at end of period | 125,147 | $ 84,107
Investment in finance leases |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 71,292 |
Current period provision for expected credit losses | 26,586 |
Write-offs charged against the allowance | (31,949) |
Allowance for credit losses at end of period | 65,929 |
Notes receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 40,964 |
Current period provision for expected credit losses | 51,287 |
Write-offs charged against the allowance | (36,222) |
Allowance for credit losses at end of period | 56,029 |
Loans receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 5,291 |
Current period provision for expected credit losses | (2,102) |
Write-offs charged against the allowance | 0 |
Allowance for credit losses at end of period | $ 3,189 |

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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: | us-gaap_BalanceSheetLocationAxis=aer_InvestmentInFinanceLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_NotesReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |