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Variable interest entities (Maximum exposure to loss in VIEs) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entities [Abstract]
Carrying value of debt and equity investments	$ 125,955	$ 123,279
Debt guarantees	0	68,901
Maximum exposure to loss	$ 125,955	$ 192,180

X

- 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

X

- Definition

Variable interest entity, entity maximum loss exposure, debt guaranteed, amount

+ References

No definition available.

+ Details

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

X

- 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

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685

+ Details

Name:	us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant