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Debt (Unsecured Narrative) (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2017 | May 31, 2016 | Oct. 31, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | May 31, 2014 | May 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs and debt discount | $ 55,768,000 | $ 45,582,000 | $ 86,184,000 |  |  |  |  |  |  |
Debt issuance cost and debt discount amortization period, end range | 2045 |  |  |  |  |  |  |  |  |
Long-term Debt | $ 27,716,999,000 | 29,641,863,000 |  |  |  |  |  |  |  |
January 2017 Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 600,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  | 3.50% |  |  |  |  |  |
ILFC Legacy Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 7,670,000,000 |  |  |  |  |  |  |  |  |
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 | 8.875% |  |  |  |  |  |  |  |  |
AerCap Aviation Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs and debt discount | $ 56,000,000 | 46,000,000 | 86,000,000 |  |  |  |  |  |  |
Long-term Debt | 27,717,000,000 | 29,642,000,000 |  |  |  |  |  |  |  |
Face amount | $ 300,000,000 |  |  |  |  |  |  |  |  | $ 300,000,000
Stated interest rate | 6.375% |  |  |  |  |  |  |  |  | 6.375%
AGAT/AICDC Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs and debt discount | $ 56,000,000 | 46,000,000 | $ 86,000,000 |  |  |  |  |  |  |
Long-term Debt | $ 27,717,000,000 | $ 29,642,000,000 |  |  |  |  |  |  |  |
Spread over reference rate | 0.50% |  |  |  |  |  |  |  |  |
Amount allowed to be repurchased as a percentage of outstanding principal | 100.00% |  |  |  |  |  |  |  |  |
AGAT/AICDC Notes [Member] | Acquisition Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 2,600,000,000 |
AGAT/AICDC Notes [Member] | 2017 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 400,000,000 |
Stated interest rate |  |  |  |  |  |  |  |  | 2.75% |
AGAT/AICDC Notes [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 1,100,000,000 |
Stated interest rate |  |  |  |  |  |  |  |  | 3.75% |
AGAT/AICDC Notes [Member] | 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |
Stated interest rate |  |  |  |  |  |  | 4.25% |  |  |
AGAT/AICDC Notes [Member] | 2021 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 1,100,000,000 |
Stated interest rate |  |  |  |  |  |  |  |  | 4.50% |
AGAT/AICDC Notes [Member] | September 2014 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 800,000,000 |  |
Stated interest rate |  |  |  |  |  |  |  | 5.00% |  |
AGAT/AICDC Notes [Member] | June 2015 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
AGAT/AICDC Notes [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |
Stated interest rate |  |  |  |  |  |  | 4.625% |  |  |
AGAT/AICDC Notes [Member] | October 2015 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 1,000,000,000 |  |  |  |
Stated interest rate |  |  |  |  |  | 4.625% |  |  |  |
AGAT/AICDC Notes [Member] | May 2016 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Stated interest rate |  |  |  |  | 3.95% |  |  |  |  |
AGAT/AICDC Notes [Member] | January 2017 Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 600,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  | 3.50% |  |  |  |  |  |

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