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Allowance for credit losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 67,153 | $ 0
Initial credit provision related to GECAS purchased financial assets with credit deterioration | 11,367 | 0
Cumulative effect due to adoption of new accounting standard | 117,547 | 67,153
Current period provision for expected credit losses | 83,697 | 50,215
Write-offs charged against the allowance | (44,670) | (13,326)
Allowance for credit losses at end of period | 117,547 | 67,153
Investment in finance leases |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 59,663 |
Initial credit provision related to GECAS purchased financial assets with credit deterioration | 9,944 |
Cumulative effect due to adoption of new accounting standard | 71,292 | 59,663
Current period provision for expected credit losses | 1,685 |
Write-offs charged against the allowance | 0 |
Allowance for credit losses at end of period | 71,292 | 59,663
Notes receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 7,490 |
Initial credit provision related to GECAS purchased financial assets with credit deterioration | 0 |
Cumulative effect due to adoption of new accounting standard | 40,964 | 7,490
Current period provision for expected credit losses | 78,144 |
Write-offs charged against the allowance | (44,670) |
Allowance for credit losses at end of period | 40,964 | 7,490
Loans receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 0 |
Initial credit provision related to GECAS purchased financial assets with credit deterioration | 1,423 |
Cumulative effect due to adoption of new accounting standard | 5,291 | 0
Current period provision for expected credit losses | 3,868 |
Write-offs charged against the allowance | 0 |
Allowance for credit losses at end of period | 5,291 | 0
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
Cumulative effect due to adoption of new accounting standard |  | 0
Allowance for credit losses at end of period |  | 0
Cumulative effect due to adoption of new accounting standard | Investment in finance leases |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 0 |
Cumulative effect due to adoption of new accounting standard |  | 0
Allowance for credit losses at end of period |  | 0
Cumulative effect due to adoption of new accounting standard | Notes receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | 0 |
Cumulative effect due to adoption of new accounting standard |  | 0
Allowance for credit losses at end of period |  | 0
Cumulative effect due to adoption of new accounting standard | Loans receivable |  |
Allowance For Credit Loss [Roll Forward] |  |
Allowance for credit losses at beginning of period | $ 0 |
Cumulative effect due to adoption of new accounting standard |  | 0
Allowance for credit losses at end of period |  | $ 0

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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, Increase, Business Acquisition + References No definition available. + Details
Name: | aer_AllowanceForCreditLossIncreaseBusinessAcquisition
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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: | credit
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
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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: |

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