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Financial Instruments
9 Months Ended
Sep. 30, 2011
(8) Financial Instruments [Abstract] 
Financial Instruments
Financial Instruments
Realized and Unrealized Gains (Losses) on Financial Instruments
Realized and unrealized gains (losses) on financial instruments are comprised of changes in the fair value of the following:
 
Three months
ended
 
Nine months
ended
 
September 30,
 
September 30,
 
2011
 
2010
 
2011
 
2010
 
amounts in millions
Non-strategic Securities
$
(240
)
 
56

 
(90
)
 
105

Exchangeable senior debentures
138

 
(188
)
 
(28
)
 
(172
)
Other
11

 
43

 
57

 
53

 
$
(91
)
 
(89
)
 
(61
)
 
(14
)