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Transaction-related expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Transaction-Related Expenses [Abstract] |  |  |  |
Banking fees | $ 60,006 |  | $ 74,601 | $ 0
Professional fees and other expenses | 9,191 |  | 20,074 |
Transaction-related expenses | $ 69,197 | $ 0 | $ 94,675 | $ 0

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- Definition Business Acquisition Costs, Banking Fees + References No definition available. + Details
Name: | aer_BusinessAcquisitionCostsBankingFees
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Acquisition Costs, Professional Fees and Other + References No definition available. + Details
Name: | aer_BusinessAcquisitionCostsProfessionalFeesAndOther
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transaction-Related Expenses + References No definition available. + Details
Name: | aer_TransactionRelatedExpensesAbstract
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration