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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.

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- 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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