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Debt (Unsecured Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Total outstanding indebtedness, excluding fair value adjustments | $ 28,960,488,000 |
Long-term Debt | 29,806,843,000 | $ 30,402,392,000
AerCap Aviation Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 29,807,000,000 | 30,402,000,000
Face amount | $ 300,000,000 |
Stated interest rate | 6.375% |
Acquisition Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 2,600,000,000 |
2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 400,000,000 |
Stated interest rate | 2.75% |
2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 1,100,000,000 |
Stated interest rate | 3.75% |
2020 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 500,000,000 |
Stated interest rate | 4.25% |
2021 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 1,100,000,000 |
Stated interest rate | 4.50% |
September 2014 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 800,000,000 |
Stated interest rate | 5.00% |
June 2015 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 1,000,000,000 |
2022 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 500,000,000 |
Stated interest rate | 4.625% |
October 2015 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 1,000,000,000 |
Stated interest rate | 4.625% |
AGAT/AICL Notes [Member] |  |
Debt Instrument [Line Items] |  |
Spread over reference rate | 0.50% |
Amount allowed to be repurchased as a percentage of outstanding principal | 100.00% |
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 15,619,510,000 | 15,982,990,000
Unsecured Debt [Member] | ILFC Legacy Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 9,220,000,000 | 11,230,020,000
Spread over reference rate | 1.95% |
Unsecured Debt [Member] | AerCap Aviation Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 300,000,000 | $ 300,000,000
Unsecured Debt [Member] | Minimum [Member] | ILFC Legacy Notes [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.875% |
Unsecured Debt [Member] | Maximum [Member] | ILFC Legacy Notes [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 8.875% |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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