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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair values of the Company's other financial instruments    
Investment in Orbitz Worldwide $ 75 $ 77
Investment in Orbitz Worldwide, fair value 178 184
Derivative assets carrying value 8 2
Derivative Asset, fair value 8 2
Derivative liability carrying value (30) (39)
Derivative liabilities, fair value (30) (39)
Total debt carrying amount (3,366) (3,407)
Total debt, Fair value $ (2,622) $ (2,353)