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Intangibles (Movements in maintenance rights) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Finite-lived Intangible Assets [Roll Forward]
Maintenance rights at beginning of period	$ 794,798
Maintenance rights at end of period	727,673
Maintenance Rights
Finite-lived Intangible Assets [Roll Forward]
Maintenance rights at beginning of period	794,798	$ 1,088,246
EOL and MR contract maintenance rights expense	(28,078)	(37,521)
MR contract maintenance rights write-off due to maintenance liability release	(1,841)	(9,403)
EOL contract maintenance rights write-off due to cash receipt	(35,346)	(97,343)
EOL and MR contract maintenance rights write-off due to sale of aircraft	(1,860)	(5,527)
Maintenance rights at end of period	$ 727,673	$ 938,452

X

- Definition

Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract intangible write off due to sale of aircraft.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract maintenance rights expense.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) contract cash receipt.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for maintenance reserve (MR) contract maintenance rights write off due to maintenance liability release.

+ References

No definition available.

+ Details

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

X

- Definition

Maintenance Rights Intangible

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: