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

Debt (AerFunding revolving credit facility and credit agreement) (Details)

v3.8.0.1
Debt (AerFunding revolving credit facility and credit agreement) (Details) - USD ($)
12 Months Ended
Dec. 11, 2017
Dec. 31, 2017
Nov. 30, 2014
Apr. 30, 2006
AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity $ 2,500,000,000.0     $ 1,000,000,000.0
Aircraft purchases, minimum percentage financed   73.50%    
Aircraft purchases, maximum percentage financed   80.00%    
Required cash reserve as a percentage of outstanding borrowings   5.00%    
AerFunding Revolving Credit Facility [Member] | Flight Equipment [Member]        
Debt Instrument [Line Items]        
Debt instrument, collateral amount   $ 1,100,000,000    
AeroTurbine Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity     $ 550,000,000.0  
Minimum [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Unused loan commitment fee, percentage   0.375%    
Average facility utilization fee percentage. equal or greater than 50%   50.00%    
Maximum [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Average utilization fee percentage, less than 50%   0.50%    
Revolving Period [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument term 3 years      
Term Out Period [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument term 2 years      
Borrowing Period [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Spread over reference rate [1]   2.00%    
Period from December 11, 2020 to December 10, 2021 [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Spread over reference rate   2.75%    
Period from December 11, 2021 to December 10, 2022 [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Spread over reference rate   3.50%    
Charitable Trust [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Ownership percentage   95.00%    
AerCap Ireland [Member] | AerFunding Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Ownership percentage   5.00%    
[1] The borrowing period is until December 10, 2020, after which the loan converts to a term loan.