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Debt (AerCap trust & AICDC notes) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2021 | Nov. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2021 | Aug. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
2021 |  |  |  | $ 2,373,410,000 |  |  |  |  |  |
2022 |  |  |  | 4,802,146,000 |  |  |  |  |  |
2023 |  |  |  | 5,143,315,000 |  |  |  |  |  |
2024 |  |  |  | 4,265,320,000 |  |  |  |  |  |
2025 |  |  |  | 5,857,331,000 |  |  |  |  |  |
Thereafter |  |  |  | 6,473,712,000 |  |  |  |  |  |
Commitment |  |  |  | 34,531,538,000 |  |  |  |  |  |
Redemption of debt |  |  |  | 11,560,015,000 | $ 6,504,830,000 | $ 4,360,520,000 |  |  |  |
Loss on debt extinguishment |  |  |  | 118,460,000 | 0 | $ 0 |  |  |  |
Unsecured |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  | 15,776,730,000 | 17,523,093,000 |  |  |  |  |
Commitment |  |  |  | 20,705,014,000 |  |  |  |  |  |
Unsecured | AerCap Trust (c) & AICDC (d) Notes |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
2021 |  |  |  | 1,131,426,000 |  |  |  |  |  |
2022 |  |  |  | 1,365,700,000 |  |  |  |  |  |
2023 |  |  |  | 2,450,000,000 |  |  |  |  |  |
2024 |  |  |  | 2,550,000,000 |  |  |  |  |  |
2025 |  |  |  | 2,650,000,000 |  |  |  |  |  |
Thereafter |  |  |  | 2,650,000,000 |  |  |  |  |  |
Debt |  |  |  | $ 12,797,126,000 | $ 12,500,000,000 |  |  |  |  |
Redemption price of debt instrument, percentage |  |  |  | 100.00% |  |  |  |  |  |
Commitment |  |  |  | $ 12,797,126,000 |  |  |  |  |  |
Unsecured | AerCap Trust (c) & AICDC (d) Notes | Minimum |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.875% |  |  |  |  |  |
Unsecured | AerCap Trust (c) & AICDC (d) Notes | Maximum |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.50% |  |  |  |  |  |
Unsecured | Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  | $ 999,000,000.0 |  | $ 500,000,000.0
Stated interest rate |  |  |  |  |  |  |  | 4.625% | 8.25% | 4.25%
Commitment |  |  |  |  |  |  |  |  | $ 742,100,000 |
Unsecured | Senior Notes Due 2025 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 6.50%
Commitment |  |  |  |  |  |  |  |  |  | $ 1,250,000,000
Unsecured | Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.50% |
Commitment |  |  |  |  |  |  |  |  | $ 1,250,000,000 |
Unsecured | 4.5% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.50% |  |  |  |  |  |  |
Redemption of debt |  |  | $ 556,000,000.0 |  |  |  |  |  |  |
Unsecured | 5.0% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |  |  |  |  |
Redemption of debt |  |  | $ 513,700,000 |  |  |  |  |  |  |
Unsecured | 4.45% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.45% |  |  |  |  |  |  |
Redemption of debt |  |  | $ 398,900,000 |  |  |  |  |  |  |
Unsecured | Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.625% |
Commitment |  |  |  |  |  |  |  |  | $ 334,500,000 |
Redemption of debt |  |  | $ 1,500,000,000 |  |  |  |  |  |  |
Unsecured | Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.15% |  |  |  |  |  |  |
Commitment |  |  | $ 900,000,000.0 |  |  |  |  |  |  |
Unsecured | Senior Notes Due 2027 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.625% |  |  |  |  |  |  |
Commitment |  |  | $ 600,000,000.0 |  |  |  |  |  |  |
Unsecured | 3.95% Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.95% |  |  |  |  |  |  |  |
Redemption of debt |  | $ 484,400,000 |  |  |  |  |  |  |  |
Unsecured | 3.5% Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.50% |  |  |  |  |  |  |  |
Redemption of debt |  | $ 232,800,000 |  |  |  |  |  |  |  |
Unsecured | Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 8.625% |
Commitment |  |  |  |  |  |  |  |  | $ 365,700,000 |
Redemption of debt |  | $ 749,300,000 |  |  |  |  |  |  |  |
Senior Notes | Senior Notes due 2021 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.50% |  |  |  |  |  |  |  |  |
Redemption of debt | $ 544,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes due 2026 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.75% |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |

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