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Intangibles (Movements in maintenance rights) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward]
Maintenance rights at beginning of period	$ 794,798
Maintenance rights at end of period	642,825	$ 794,798
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	(45,655)	(76,611)
MR contract maintenance rights write-off due to maintenance liability release	(35,897)	(19,848)
EOL contract maintenance rights write-off due to cash receipt	(51,463)	(148,289)
EOL and MR contract maintenance rights write-off due to sale of aircraft and impairment	(18,958)	(48,700)
Maintenance rights at end of period	$ 642,825	$ 794,798

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

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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

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

X

- Definition

Maintenance Rights

+ References

No definition available.

+ Details

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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

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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: