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Debt (Institutional secured term & secured portfolio loans) (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Commitment	$ 36,782,018
Full Recourse Secured Debt | Institutional secured term loans & secured portfolio loans
Debt Instrument [Line Items]
Commitment	$ 500,000

X

- Definition

Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=aer_FullRecourseSecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=aer_InstitutionalSecuredTermLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: