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Debt (ALS II Narrative) (Details) - ALS II Debt [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) item
Debt Instrument [Line Items] |
Number of aircraft designated as collateral | item | 26
Debt Instrument, Collateral Amount | $ | $ 745.3

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- Definition Debt Instrument, Aircraft Collateral Number + References No definition available. + Details
Name: | aer_DebtInstrumentAircraftCollateralNumber
Namespace Prefix: | aer_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=aer_AircraftLeaseSecuritizationLimitedTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |