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

Debt (Revolving Credit Facility) (Details)

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Debt (Revolving Credit Facility) (Details) (USD $)
12 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2006
Revolving Credit Facility [Member]
Dec. 31, 2011
Jersey Charitable Trusts [Member]
Revolving Credit Facility [Member]
Dec. 31, 2011
AerCap Ireland [Member]
Revolving Credit Facility [Member]
Jun. 10, 2010
Class A Loans [Member]
Revolving Credit Facility [Member]
Jun. 30, 2010
Class A Loans [Member]
Revolving Credit Facility [Member]
Jun. 10, 2010
Class B Loans [Member]
Revolving Credit Facility [Member]
Jun. 30, 2010
Class B Loans [Member]
Revolving Credit Facility [Member]
Dec. 31, 2011
Boeing 737NG [Member]
Minimum [Member]
Revolving Credit Facility [Member]
Dec. 31, 2011
Boeing 737NG [Member]
Maximum [Member]
Revolving Credit Facility [Member]
Debt Instrument [Line Items]                      
Ownership percentage       95.00% 5.00%            
Credit facility, amount     $ 1,000,000,000                
Maximum advance limit of credit facility   775,000,000       705,500,000 830,000,000 144,500,000 170,000,000    
Credit facility expiry date   May 9, 2011                  
Line of credit facility maximum borrowing capacity appraised value                   73.00% 78.00%
Book value of aircraft pledged as collateral for debt   $ 600,000,000                  
Number of aircraft owned 251 18