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

Debt (Additional information) (Details)

v3.8.0.1
Debt (Additional information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2018
May 31, 2012
Debt Instrument [Line Items]          
Outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts $ 28,263,121,000        
Fair value adjustments 300,000,000        
Debt issuance costs and debt discounts 160,061,000 $ 156,901,000      
Undrawn lines of credit 6,706,576,000        
Notes payable 28,420,739,000 27,716,999,000      
Amortization of debt issuance costs and debt discount 65,420,000 55,768,000 $ 45,582,000    
Other Secured Debt Limited Recourse In Nature [Member] | Other Secured Debt [Member]          
Debt Instrument [Line Items]          
Notes payable 166,100,000        
ILFC Legacy Notes [Member]          
Debt Instrument [Line Items]          
Notes payable $ 5,700,000,000        
ILFC Legacy Notes [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Stated interest rate 3.875%        
ILFC Legacy Notes [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Stated interest rate 8.625%        
AerCap Aviation Notes [Member]          
Debt Instrument [Line Items]          
Stated interest rate         6.375%
Face amount         $ 300,000,000.0
Senior Notes [Member] | AGAT/AICDC Notes Due 2023 [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Stated interest rate       3.30%  
Face amount       $ 600,000,000  
Senior Notes [Member] | AGAT/AICDC Notes Due 2028 [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Stated interest rate       3.875%  
Face amount       $ 550,000,000  
AGAT/AICDC Notes          
Debt Instrument [Line Items]          
Notes payable $ 28,421,000,000 27,717,000,000      
Amortization of debt issuance costs and debt discount $ 65,000,000 $ 56,000,000 $ 46,000,000    
Amount allowed to be repurchased as a percentage of outstanding principal 100.00%        
Spread over reference rate 0.50%