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Net investment in finance and sales-type leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Flight Equipment, Net [Abstract]
Sales-type and direct financing leases, impairment charge	$ 22.0

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- Definition

Sales-type and Direct Financing Leases, Impairment Loss

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_FlightEquipmentNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration