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Pension Plans (Defined Contribution Plans Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Dutch Defined Contribution Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined employer contributions | $ 400,000 | $ 300,000 | $ 0
Defined contribution plan, pension contributions outstanding | 0 |  |
Irish Defined Contribution Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined employer contributions | 1,100,000 | $ 300,000 | $ 200,000
Defined contribution plan, pension contributions outstanding | $ 0 |  |

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- Definition Defined Contribution Plan, Pension Contributions Outstanding + References No definition available. + Details
Name: | aer_DefinedContributionPlanPensionContributionsOutstanding
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=aer_DutchDefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=aer_IrishDefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |