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Guarantees, Indemnities and Warranties (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2011
Guarantees Indemnities and Warranties (Textual) [Abstract]    
Guarantees, letters of credit and similar arrangements outstanding   $ 192
Operating lease provided period to lease   5 years
Aircraft purchase from the lessor 50  
Gain on sale of aircraft   3
Leaseback agreement and the associated residual value guarantee charge 3  
Realization of previously recognized loss on leaseback agreement and the associated residual value guarantee charge 22  
Bond cancelled and Liability reversed   10
Contingent liability for construction obligation   $ 10