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Allowance for credit losses (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
COVID-19 Pandemic
Allowance For Credit Loss [Line Items]
Increase in allowance for credit loss	$ 50.2

X

- Definition

Allowance For Credit Loss

+ References

No definition available.

+ Details

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

X

- Definition

Allowance for Credit Loss, Period Increase (Decrease)

+ References

No definition available.

+ Details

Name:	aer_AllowanceForCreditLossPeriodIncreaseDecrease
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=aer_COVID19PandemicMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: