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

Derivative Assets And Liabilities (Narrative) (Details)

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Derivative Assets And Liabilities (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Derivative [Line Items]    
Derivative, Notional Amount $ 3,800,000,000  
Notional amounts of derivatives 500,000,000 0
Fair value of derivatives (6,100,000)  
Interest rate swaps, fair value $ (9,800,000) $ 5,700,000
Maximum length of time hedged in cash flow hedge 12 years  
Number of interest rate swaps held 4  
Number of aircraft 251  
Minimum [Member]
   
Derivative [Line Items]    
Derivative variable benchmark interest range, maturity period, months 1  
Maximum [Member]
   
Derivative [Line Items]    
Derivative variable benchmark interest range, maturity period, months 6  
Genesis [Member]
   
Derivative [Line Items]    
Number of interest rate swaps held 2