Orbitz Worldwide - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Related Party Transaction [Line Items]
Investment in Orbitz Worldwide	$ 15			$ 15
(Benefit from)/provision for income taxes	(7)		(8)	(24)	(24)
Equity in earnings of investment in Orbitz Worldwide	6		7	8	6
Accrued expenses and other current liabilities	596			596		537
Orbitz Worldwide [Member]
Related Party Transaction [Line Items]
Equity investments	45.00%			45.00%
Dilution of investment						46.00%
Investment in Orbitz Worldwide	15			15		0
Fair market value of investments in Orbitz Worldwide	469			469
Investment reduced in Orbitz Worldwide						0
(Benefit from)/provision for income taxes	(2)	158	(1)	165	(3)
Equity in earnings of investment in Orbitz Worldwide	6		7	8	6
Equity method investment revenue intercompany	18		21	60	72
Accrued expenses and other current liabilities	$ 14			$ 14		$ 5