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Summarized Condensed Financial Information of LivingSocial (Detail) (LivingSocial, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
LivingSocial
    
Statement of Operations:    
Revenue $ 135 $ 110
Operating expense 179 201
Operating loss (44) (91)
Net income (loss) $ (50) [1] $ 156 [1]
[1] The difference between the operating loss and net income for the three months ended March 31, 2012 is primarily due to non-operating, non-cash gains on previously held equity positions in companies that LivingSocial acquired during Q1 2012.