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v3.23.2

Allowance for credit losses - Movement in allowance (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 137,861 | $ 117,547
Current period (decrease) increase in provision for expected credit losses | (980) | 75,771
Write-offs charged against the allowance | (36,883) | (68,171)
Allowance for credit losses at end of period | 99,998 | $ 125,147
Investment in finance leases |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 23,025 |
Current period (decrease) increase in provision for expected credit losses | (11,256) |
Write-offs charged against the allowance | 0 |
Allowance for credit losses at end of period | 11,769 |
Notes receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 110,938 |
Current period (decrease) increase in provision for expected credit losses | 12,357 |
Write-offs charged against the allowance | (36,883) |
Allowance for credit losses at end of period | 86,412 |
Loans receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 3,898 |
Current period (decrease) increase in provision for expected credit losses | (2,081) |
Write-offs charged against the allowance | 0 |
Allowance for credit losses at end of period | $ 1,817 |

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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: |