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, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Equivalents, at Carrying Value $ 2,316 $ 694  
Realized and unrealized gains (losses) on financial instruments, net (note 5) (351) 84 62
Available-for-sale securities 1,815 1,165  
Debt 2,930 2,443  
Quoted Prices In Active Markets For Identical Assets (Level 1)
     
Cash Equivalents, at Carrying Value 2,305 694  
Available-for-sale securities 1,668 1,165  
Debt 0 0  
Significant Other Observable Inputs (Level 2)
     
Cash Equivalents, at Carrying Value 11 0  
Available-for-sale securities 147 0  
Debt 2,930 2,443  
Non-Strategic Securities [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) 470 55 202
Exchangeable Senior Debentures [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) (602) (46) (257)
Other Financial Instruments [Member]
     
Realized and unrealized gains (losses) on financial instruments, net (note 5) $ (219) $ 75 $ 117