Financial Instruments (Details 3) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair values of the Company's other financial instruments
Investments in Orbitz Worldwide, Carrying Amount	$ 7,000,000
Derivative assets, fair Value	3,000,000	15,000,000
Derivative liabilities, Fair Value	(8,000,000)	(4,000,000)
Total debt, Carrying Amount	(3,464,000,000)	(3,430,000,000)
Fair Value Hierarchy, Level 1 [Member]
Fair values of the Company's other financial instruments
Investments in Orbitz Worldwide, Carrying Amount	7,000,000
Fair market value of investments in Orbitz Worldwide	279,000,000	133,000,000
Fair Value Hierarchy, Level 3 [Member]
Fair values of the Company's other financial instruments
Derivative assets, Carrying Amount	3,000,000	15,000,000
Derivative assets, fair Value	3,000,000	15,000,000
Fair Value Hierarchy, Level 2 [Member]
Fair values of the Company's other financial instruments
Derivative liabilities, Carrying Amount	(8,000,000)	(4,000,000)
Derivative liabilities, Fair Value	(8,000,000)	(4,000,000)
Total debt, Carrying Amount	(3,464,000,000)	(3,430,000,000)
Total debt, Fair Value	$ (3,354,000,000)	$ (2,899,000,000)