Annual report pursuant to Section 13 and 15(d)

Tracking Stock (Details)

v2.4.0.6
Tracking Stock (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Aug. 09, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.05            
Cash and Cash Equivalents, at Carrying Value   $ 2,660   $ 847 $ 847 $ 1,353 $ 1,955
Cash attributed from the Interactive Group to the Ventures Group     1,346        
Ventures Group [Member]
              
Cash and Cash Equivalents, at Carrying Value   1,961   0 0 0 0
Interactive Group [Member]
              
Cash and Cash Equivalents, at Carrying Value   $ 699   $ 847 $ 847 $ 1,353 $ 1,955