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

Debt (ALS I And II Debt) (Details)

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Debt (ALS I And II Debt) (Details) (USD $)
0 Months Ended 12 Months Ended 12 Months Ended
Mar. 23, 2012
Dec. 31, 2011
May 07, 2007
ALS I Debt [Member]
May 08, 2007
ALS I Debt [Member]
Dec. 31, 2011
ALS I Debt [Member]
Dec. 31, 2007
ALS I Debt [Member]
Aug. 10, 2005
ALS I Debt [Member]
Dec. 31, 2011
ALS II Debt [Member]
Aug. 10, 2005
Jersey Charitable Trusts [Member]
ALS I Debt [Member]
Aug. 10, 2005
AerCap Ireland [Member]
ALS I Debt [Member]
Jun. 26, 2008
Class A-1 [Member]
ALS II Debt [Member]
Debt Instrument [Line Items]                      
Ownership percentage                 95.10% 4.90%  
Issuance of securitized notes       $ 1,700,000,000              
Additional interest expense           27,400,000          
Maturity date of notes               Jun. 26, 2038      
Book value of aircraft pledged as collateral for debt         1,100,000,000     1,100,000,000      
Notes payable                     $ 0
Number of aircraft owned   251   70     42 30      
Number of additional aircraft     4                
Number of aircraft sold           51          
Number of aircraft delivered 4             70      
Number of aircraft pledged as collateral   38     51     30      
Number of aircraft acquired       24              
Aircraft available to lenders in case of bankruptcy         57