Summarized Condensed Financial Information of LivingSocial (Detail) (Living Social, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Living Social
Statement of Operations:
Revenue	$ 536		$ 250
Operating expense	862		669
Impairment charge	579
Operating loss	(905)		(419)
Net loss	(650)	[1]	(499)	[1]
Balance Sheet:
Current assets	76		176
Noncurrent assets	218		271
Current liabilities	338		210
Noncurrent liabilities	14		32
Mandatorily redeemable stock	$ 205		$ 201

[1] The difference between the operating loss and net loss for 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.