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Pension Plans (Defined Contribution Plans Narrative) (Details) - USD ($)	12 Months Ended
	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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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