Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Debt (AerCap trust & AICDC notes) (Details)

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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