Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Investments In Available-For-Sale Securities And Other Cost Investments) (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments (Investments In Available-For-Sale Securities And Other Cost Investments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investments in available-for-sale securities and other cost investments $ 2,377 $ 1,819
Interactive Group [Member]
   
Cost Method Investments 4 4
Investments in available-for-sale securities and other cost investments 4 4
Ventures Group [Member]
   
Investments in available-for-sale securities and other cost investments 2,373 1,815
Ventures Group [Member] | Time Warner Inc [Member]
   
Investments in available-for-sale securities and other cost investments 1,255 1,042
Ventures Group [Member] | Time Warner Cable Inc [Member]
   
Investments in available-for-sale securities and other cost investments 525 531
Ventures Group [Member] | AOL Inc [Member]
   
Investments in available-for-sale securities and other cost investments 76 59
Ventures Group [Member] | TripAdvisor AFS Securities [Member]
   
Investments in available-for-sale securities and other cost investments 191 99
Ventures Group [Member] | Other Investments [Member]
   
Investments in available-for-sale securities and other cost investments $ 326 $ 84