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
Sep. 30, 2012
Dec. 31, 2011
Investments in available-for-sale securities and other cost investments (note 7) $ 1,642 $ 1,168
Liberty Interactive [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 3 3
Liberty Interactive [Member] | Other [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 3 3
Liberty Ventures [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 1,639 1,165
Liberty Ventures [Member] | Other [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 61 0
Liberty Ventures [Member] | Time Warner Inc [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 988 787
Liberty Ventures [Member] | Time Warner Cable Inc [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) 520 348
Liberty Ventures [Member] | AOL Inc [Member]
   
Investments in available-for-sale securities and other cost investments (note 7) $ 70 $ 30