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Variable interest entities (Narrative) (Details) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2017 | Feb. 28, 2018 USD ($) | Dec. 31, 2017 USD ($) aircraft | Mar. 09, 2018 aircraft | Dec. 31, 2017 USD ($) aircraft airline | Dec. 31, 2016 USD ($) | Jun. 30, 2013 aircraft
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 980 |  | 980 |  |
Debt guarantees |  |  | $ 104,867,000 |  | $ 104,867,000 | $ 125,429,000 |
Aercap Partners I Facility [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Outstanding amount under senior debt facility |  |  | $ 59,851,000 |  | $ 59,851,000 |  |
ALS II [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage | 100.00% |  |  |  |  |  |
Ownership percentage |  |  | 5.00% |  | 5.00% |  |
ALS II [Member] | ALS II Class E-1 Notes [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  | $ 350,000,000 |  | $ 350,000,000 |  |
Percent of the subordinated fixed rate deferrable interest asset-backed notes | 100.00% |  |  |  |  |  |
AerFunding [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 100.00% |  |
Ownership percentage |  |  | 5.00% |  | 5.00% |  |
Airbus 320 Family Aircraft [Member] | ALS II [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 25 |  | 25 |  |
Boeing 737-800 Aircraft [Member] | ACSAL [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 8 |  | 8 |  | 8
AerCap Holdings N.V. | ACSAL [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 19.00%
AerCap Partners I [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | $ 63,800,000 |  | $ 63,800,000 |  |
AerCap Partners I [Member] | Aercap Partners I Facility [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Outstanding amount under senior debt facility |  |  | $ 59,900,000 |  | $ 59,900,000 |  |
AerCap Partners I [Member] | Boeing 737 NG Aircraft [Member] | Aercap Partners I Facility [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 7 |  | 7 |  |
AerCap Partners I [Member] | Deucalion Aviation Funds [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | $ 31,900,000 |  | $ 31,900,000 |  |
AerCap Partners I [Member] | AerCap Holdings N.V. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  | 31,900,000 |  | $ 31,900,000 |  |
AerCap Partners II [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | 16,800,000 |  | $ 16,800,000 |  |
AerCap Partners II [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Repayments of subordinated debt |  | $ 16,800,000 |  |  |  |  |
AerCap Partners II [Member] | Deucalion Aviation Funds [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | 8,400,000 |  | $ 8,400,000 |  |
AerCap Partners II [Member] | AerCap Holdings N.V. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  | 8,400,000 |  | $ 8,400,000 |  |
Aercap Partners 767 [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | 31,000,000 |  | $ 31,000,000 |  |
Senior debt facility |  |  | 11,500,000 |  | $ 11,500,000 |  |
Aercap Partners 767 [Member] | Deucalion Aviation Funds [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
Subordinated debt |  |  | 15,500,000 |  | $ 15,500,000 |  |
Aercap Partners 767 [Member] | AerCap Holdings N.V. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  | $ 15,500,000 |  | $ 15,500,000 |  |
Aercap Partners 767 [Member] | AerCap Holdings N.V. | Boeing 767 300ER Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 2 |  | 2 |  |
Aercap Partners 767 [Member] | China Aviation Supplies Holding Company [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
AerFunding [Member] | Boeing 737 NG Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 6 |  | 6 |  |
AerFunding [Member] | Airbus 320 Family Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 4 |  | 4 |  |
AerFunding [Member] | Airbus 320 neoFamily Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 2 |  | 2 |  |
AerFunding [Member] | Airbus 330 Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 1 |  | 1 |  |
AerFunding [Member] | Airbus 350 Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 1 |  | 1 |  |
AerFunding [Member] | Boeing 787 Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 4 |  | 4 |  |
AerFunding [Member] | AerCap Holdings N.V. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  | $ 272,800,000 |  | $ 272,800,000 |  |
Credit facility amount outstanding |  |  | 878,400,000 |  | $ 878,400,000 |  |
AerDragon [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |
AerDragon [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Debt guarantees |  |  | $ 0 |  | $ 0 | 3,400,000 |
AerDragon [Member] | Narrowbody Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 29 |  | 29 |  |
Number of airlines | airline |  |  |  |  | 10 |  |
AerLift [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Debt guarantees |  |  | $ 104,900,000 |  | $ 104,900,000 | $ 122,000,000 |
AerLift [Member] | Widebody Aircraft [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 4 |  | 4 |  |
AerLift [Member] | AerCap Holdings N.V. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 39.00% |  |
Peregrine [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 9.50% |  |
Number of aircraft acquired | aircraft |  |  | 4 |  |  |  |
Number of aircraft | aircraft |  |  | 21 |  | 21 |  |
Peregrine [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of aircraft acquired | aircraft |  |  |  | 17 |  |  |

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