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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.