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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entities [Abstract]
Carrying value of debt and equity investments	$ 133,401	$ 125,955

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- Definition

Variable Interest Entities [Abstract]

+ References

No definition available.

+ Details

Name:	aer_VariableInterestEntitiesAbstract
Namespace Prefix:	aer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Variable Interest Entity, Entity Maximum Loss Exposure, Equity Investment and Cost Method Investment Amount

+ References

No definition available.

+ Details

Name:	aer_VariableInterestEntityEntityMaximumLossExposureEquityInvestmentandCostMethodInvestmentAmount
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant