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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Variable Interest Entities [Abstract] |  |
Carrying value of debt and equity investments | $ 125,955 | $ 123,279
Debt guarantees | 0 | 68,901
Maximum exposure to loss | $ 125,955 | $ 192,180

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- Definition Variable Interest Entities [Abstract] + References No definition available. + Details
Name: | aer_VariableInterestEntitiesAbstract
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable interest entity, entity maximum loss exposure, debt guaranteed, amount + References No definition available. + Details
Name: | aer_VariableInterestEntityEntityMaximumLossExposureDebtGuaranteedAmount
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Variable Interest Entity, Entity Maximum Loss Exposure, Equity Investment and Cost Method Investment Amount + References No definition available. + Details
Name: | aer_VariableInterestEntityEntityMaximumLossExposureEquityInvestmentandCostMethodInvestmentAmount
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant