Summarized Condensed Financial Information of LivingSocial (Detail) (LivingSocial, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
LivingSocial
Statement of Operations:
Revenue	$ 264		$ 248
Operating expense	342		425
Operating loss	(78)		(177)
Net income (loss)	$ (81)	[1]	$ 65	[1]

[1] The difference between the operating loss and net income for the six months ended June 30, 2012 is primarily due to non-operating, non-cash gains on previously held equity positions in companies that LivingSocial acquired during Q1 2012.