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Debt (AerCap trust & AICDC notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Notes payable | $ 28,420,739 | $ 27,716,999
Unsecured Debt [Member] | AGAT/AICDC May 2014 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 2,199,864 |
Unsecured Debt [Member] | AGAT/AICDC May 2014 Notes [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.75% |
Unsecured Debt [Member] | AGAT/AICDC May 2014 Notes [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.50% |
Unsecured Debt [Member] | AGAT/AICDC September 2014 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 800,000 |
Stated interest rate | 5.00% |
Unsecured Debt [Member] | AGAT/AICDC June 2015 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,000,000 |
Unsecured Debt [Member] | AGAT/AICDC June 2015 Notes [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.25% |
Unsecured Debt [Member] | AGAT/AICDC June 2015 Notes [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.625% |
Unsecured Debt [Member] | AGAT/AICDC October 2015 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,000,000 |
Stated interest rate | 4.625% |
Unsecured Debt [Member] | AGAT/AICDC May 2016 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,000,000 |
Stated interest rate | 3.95% |
Unsecured Debt [Member] | AGAT/AICDC January 2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 600,000 |
Stated interest rate | 3.50% |
Unsecured Debt [Member] | AGAT/AICDC July 2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 1,000,000 |
Stated interest rate | 3.65% |
Unsecured Debt [Member] | AGAT/AICDC November 2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 800,000 |
Stated interest rate | 3.50% |
Unsecured Debt [Member] | AGAT/AICDC Notes |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 8,399,864 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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