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Related party transactions (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 aircraft
Arctic Aviation Assets DAC |
Related Party Transaction [Line Items] |
Number of aircraft sold | 3

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- Definition Number Of Aircrafts Sold + References No definition available. + Details
Name: | aer_NumberOfAircraftsSold
Namespace Prefix: | aer_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=aer_ArcticAviationAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |