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Quarterly report pursuant to Section 13 or 15(d)

Tracking Stock (Details)

v2.4.0.8
Tracking Stock (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Tracking Stock [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.05 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, at Carrying Value Ìý Ìý $ 981 $ 981 $ 2,660 $ 1,793 $ 847 $ 1,793
Reattribution Of Cash Between Tracking Stocks Ìý 0 Ìý Ìý Ìý Ìý Ìý Ìý
Ventures Group [Member]
Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Tracking Stock [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, at Carrying Value Ìý Ìý 526 Ìý 1,961 1,235 0 Ìý
Reattribution Of Cash Between Tracking Stocks Ìý 1,346 Ìý Ìý Ìý Ìý Ìý Ìý
Interactive Group [Member]
Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Tracking Stock [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Cash and Cash Equivalents, at Carrying Value Ìý Ìý 455 Ìý 699 558 847 Ìý
Reattribution Of Cash Between Tracking Stocks Ìý $ (1,346) Ìý Ìý Ìý Ìý Ìý Ìý