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Supplemental guarantor financial information (Narrative) (Details) $ in Billions	Jun. 30, 2019 USD ($)
Condensed Financial Information Disclosure [Abstract]
Operating lease right of use asset and liability	$ 1.4

X

- Definition

Operating Lease, Right-of-Use Asset And Liability

+ References

No definition available.

+ Details

Name:	aer_OperatingLeaseRightofUseAssetAndLiability
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration