Summarized Condensed Financial Information of LivingSocial (Detail) (Living Social, USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Living Social
Statement of Operations:
Revenue	$ 138		$ 59		$ 248		$ 100
Operating expense	234		191		436		335
Operating loss	(96)		(132)		(188)		(235)
Net income (loss)	$ (93)	[1]	$ (198)	[1]	$ 63	[1]	$ (258)	[1]

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