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Debt - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Oct. 31, 2024 USD ($) | Jul. 31, 2024 USD ($) interestPaymentPeriod | Jun. 30, 2015 USD ($) deferralPeriod | Dec. 31, 2005 USD ($) tranche | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Aug. 31, 2024 USD ($) | May 31, 2024 USD ($) | Apr. 30, 2024 | Jan. 31, 2024 USD ($) | Mar. 31, 2021 USD ($) | Oct. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts |  |  |  |  | $ 45,537,139,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount (premium) and debt issuance costs, net |  |  |  |  | 242,984,000 | $ 212,622,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility and other available secured debt, remaining borrowing capacity |  |  |  |  | 11,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs, debt discount, debt premium and lease premium |  |  |  |  | 63,000,000 | 75,000,000 | $ 82,000,000 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 45,294,511,000 | 46,483,903,000 |  |  |  |  |  |  |  |  |  |  |
AerFunding | Charitable Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |
AerFunding | AerCap Ireland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 34,750,000,000 | 34,295,349,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured | Revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000 |
Unsecured | Citi revolving credit facility II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 4,500,000,000 |  |  |  | $ 4,350,000,000 |  |  |
Unsecured | Citi revolving credit facility I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000
Secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | 8,537,495,000 | 10,151,176,000 |  |  |  |  |  |  |  |  |  |  |
Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 2,250,000,000 | 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |
AerCap Trust & AICDC Notes | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt instrument, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 29,950,000,000 | 31,215,349,000 |  |  |  |  |  |  |  |  |  |  |
5.100% Senior Unsecured Debt Due 2029 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 5.10% |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |
5.300% Senior Unsecured Debt Due 2034 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |
Senior Notes Due 2027 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  |  |  |  |  | 6.45% |  |  |  |  |
4.625% Senior Unsecured Debt Due 2029 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  |  | 4.625% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |
4.950% Senior Unsecured Debt Due 2034 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  |  | 4.95% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |
4875% Senior Unsecured Debt Due 2028 | Unsecured | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |
5.375% Senior Unsecured Debt Due 2031 | Unsecured | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |
Unsecured Term Loan | Line of Credit | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Unsecured Term Loan | Line of Credit | Setanta |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
October due 2029 | Line of Credit | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export credit facilities | Secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | 974,269,000 | 1,034,687,000 |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Notes | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Notes | Subordinated | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, floating reference rate, duration |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Notes | Subordinated | Ten Year Constant Maturity U.S. Treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, floating reference rate, duration |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Notes | Subordinated | Thirty Year Constant Maturity U.S. Treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, floating reference rate, duration |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Debt $400 Million Tranche | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |
ECAPS Subordinated Debt $600 Million Tranche | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  |  | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |
2045 Junior Subordinated Notes | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt instrument, percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  |  | 4.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, fixed interest rate |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term interest deferral period | deferralPeriod |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term payment deferral period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate Reset Junior Subordinated Notes Due 2055 | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  | 6.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt instrument, percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread over reference rate |  | 2.72% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, reset period, duration |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, consecutive semi-annual interest payment | interestPaymentPeriod |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2079 Junior Subordinated Notes | Subordinated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt instrument, percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Debt, fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.875% |  |
AerFunding Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term out period |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AerFunding Revolving Credit Facility | Secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 1,010,699,000 | $ 1,032,151,000 |  |  |  |  |  |  |  |  |  |  |
Minimum | AerCap Trust & AICDC Notes | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Export credit facilities | Secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum | AerCap Trust & AICDC Notes | Unsecured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (in percentage) |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Export credit facilities | Secured |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |

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