Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Realized and unrealized gains on financial instruments, net $ 113 $ 122  
Net impact from Non-strategic Securities 73 205  
Short term marketable securities 319   299
Available-for-sale securities 1,822    
Financial instrument liabilities 216    
Fair Value, Inputs, Level 1 [Member]
     
Short term marketable securities 0    
Available-for-sale securities 1,526    
Financial instrument liabilities 220    
Fair Value, Inputs, Level 2 [Member]
     
Short term marketable securities 319    
Available-for-sale securities 296    
Financial instrument liabilities (4)    
Fair Value, Inputs, Level 3 [Member]
     
Short term marketable securities 0    
Available-for-sale securities 0    
Financial instrument liabilities 0    
Non-Strategic Securities [Member]
     
Realized and unrealized gains on financial instruments, net 73 300  
Borrowed Shares [Member]
     
Realized and unrealized gains on financial instruments, net 0 (95)  
Exchangeable Senior Debentures [Member]
     
Realized and unrealized gains on financial instruments, net 0 (86)  
Other Financial Instruments [Member]
     
Realized and unrealized gains on financial instruments, net $ 40 $ 3