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Debt (Additional information) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2018 | May 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts | $ 28,263,121,000 |  |  |  |
Fair value adjustments | 300,000,000 |  |  |  |
Debt issuance costs and debt discounts | 160,061,000 | $ 156,901,000 |  |  |
Undrawn lines of credit | 6,706,576,000 |  |  |  |
Notes payable | 28,420,739,000 | 27,716,999,000 |  |  |
Amortization of debt issuance costs and debt discount | 65,420,000 | 55,768,000 | $ 45,582,000 |  |
Other Secured Debt Limited Recourse In Nature [Member] | Other Secured Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | 166,100,000 |  |  |  |
ILFC Legacy Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | $ 5,700,000,000 |  |  |  |
ILFC Legacy Notes [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.875% |  |  |  |
ILFC Legacy Notes [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 8.625% |  |  |  |
AerCap Aviation Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  |  | 6.375%
Face amount |  |  |  |  | $ 300,000,000.0
Senior Notes [Member] | AGAT/AICDC Notes Due 2023 [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  | 3.30% |
Face amount |  |  |  | $ 600,000,000 |
Senior Notes [Member] | AGAT/AICDC Notes Due 2028 [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  | 3.875% |
Face amount |  |  |  | $ 550,000,000 |
AGAT/AICDC Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable | $ 28,421,000,000 | 27,717,000,000 |  |  |
Amortization of debt issuance costs and debt discount | $ 65,000,000 | $ 56,000,000 | $ 46,000,000 |  |
Amount allowed to be repurchased as a percentage of outstanding principal | 100.00% |  |  |  |
Spread over reference rate | 0.50% |  |  |  |

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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