Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Realized And Unrealized Gains (Losses) On Financial Instruments) (Details)

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Financial Instruments (Realized And Unrealized Gains (Losses) On Financial Instruments) (Details) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Realized and unrealized gains on financial instruments, net (note 8) $ 143 $ (81) $ 186 $ 86
Equity Collars [Member]
        
Realized and unrealized gains on financial instruments, net (note 8)   (4)   (2)
Borrowed Shares [Member]
        
Realized and unrealized gains on financial instruments, net (note 8) (23) [1] 64 [1] (118) [1] 61 [1]
Other Financial Instruments [Member]
        
Realized and unrealized gains on financial instruments, net (note 8) 6 (48) 40 (19)
Non-Strategic Securities [Member]
        
Realized and unrealized gains on financial instruments, net (note 8) 138 [1] (179) [1] 429 [1] 30 [1]
Exchangeable Senior Debentures [Member]
        
Realized and unrealized gains on financial instruments, net (note 8) 22 86 (165) 16
Securities Pledged [Member]
        
Realized and unrealized gains on financial instruments, net (note 8)       $ 61
[1] 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 Six months ended June 30, June 30, 2011 2010 2011 2010 amounts in millions Non-strategic Securities (1) $ 138 (179) 429 30 Exchangeable senior debentures 22 86 (165) 16 Equity collars -- (4) -- (2) Borrowed shares (1) (23) 64 (118) 61 Other 6 (48) 40 (19) $ 143 (81) 186 86 (1)The unrealized gains (losses) on Non-strategic Securities for the three and six months ended June 30, 2011 include gains of $23 million and $118 million, respectively, and for the three and six months ended June 30, 2010 include losses of $64 million and $61 million, respectively, related to securities pledged as collateral under the share borrowing arrangements.