Annual report pursuant to Section 13 and 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Realized and unrealized gains (losses) on financial instruments, net (note 5) $ 84 $ 62  
Short term marketable securities 46 0  
Available-for-sale securities 1,165 1,109  
Financial instrument liabilities 61 128  
Debt 2,443 2,506  
Quoted Prices In Active Markets For Identical Assets (Level 1)
     
Short term marketable securities 0 0  
Available-for-sale securities 1,165 1,109  
Financial instrument liabilities 0 0  
Debt 0 0  
Significant Other Observable Inputs (Level 2)
     
Short term marketable securities 46 0  
Available-for-sale securities 0 0  
Financial instrument liabilities 61 128  
Debt 2,443 2,506  
Fair Value, Inputs, Level 3 [Member]
     
Short term marketable securities 0 0  
Available-for-sale securities 0 0  
Financial instrument liabilities 0 0  
Debt 0 0  
Non-Strategic Securities [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) 55 202 238
Exchangeable Senior Debentures [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) (46) (257) (856)
Other Financial Instruments [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) $ 75 $ 117 $ 29