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Intangibles - Movements in maintenance rights (Details) - Maintenance Rights - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Finite-lived Intangible Assets [Roll Forward]
Maintenance rights at beginning of period	$ 3,292,007	$ 642,825
EOL and MR contract maintenance rights expense	(166,512)	(6,170)
MR contract maintenance rights write-off offset by maintenance liability release	(242,142)	(7,340)
EOL contract maintenance rights write-off offset by EOL compensation received	(65,506)	(16,701)
EOL and MR contract maintenance rights write-off due to sale of aircraft	(2,333)	(2,362)
Maintenance rights at end of period	$ 2,815,514	$ 610,252

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 maintenance reserve (MR) contract maintenance rights write off due to maintenance liability release.

+ References

No definition available.

+ Details

Name:	aer_FiniteLivedIntangibleAssetsMaintenanceReserveContractRightsExpenseOffsetByMaintenanceLiabilityRelease
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_FiniteLivedIntangibleAssetsWriteOffOffsetByEndOfLeaseContractCompensationReceived
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

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=aer_MaintenanceRightsIntangibleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: