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Debt (AerFunding revolving credit facility and credit agreement) (Details) - USD ($)			12 Months Ended
		Dec. 11, 2017	Dec. 31, 2017	Nov. 30, 2014	Apr. 30, 2006
AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 2,500,000,000.0			$ 1,000,000,000.0
Aircraft purchases, minimum percentage financed			73.50%
Aircraft purchases, maximum percentage financed			80.00%
Required cash reserve as a percentage of outstanding borrowings			5.00%
AerFunding Revolving Credit Facility [Member] | Flight Equipment [Member]
Debt Instrument [Line Items]
Debt instrument, collateral amount			$ 1,100,000,000
AeroTurbine Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 550,000,000.0
Minimum [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unused loan commitment fee, percentage			0.375%
Average facility utilization fee percentage. equal or greater than 50%			50.00%
Maximum [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Average utilization fee percentage, less than 50%			0.50%
Revolving Period [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument term		3 years
Term Out Period [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument term		2 years
Borrowing Period [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread over reference rate	[1]		2.00%
Period from December 11, 2020 to December 10, 2021 [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread over reference rate			2.75%
Period from December 11, 2021 to December 10, 2022 [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread over reference rate			3.50%
Charitable Trust [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Ownership percentage			95.00%
AerCap Ireland [Member] | AerFunding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Ownership percentage			5.00%
[1] The borrowing period is until December 10, 2020, after which the loan converts to a term loan.

X

- Definition

Aircraft purchases, maximum percentage financed

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aircraft Purchases, Minimum Percentage Financed

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Covenant, Cash Reserve as a Percentage of Outstanding Borrowings

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, Average Utilization Range One

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, Average Utilization Range Two

+ References

No definition available.

+ Details

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Namespace Prefix:	aer_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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

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X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685

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- Details

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- Details

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- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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