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
Jun. 30, 2011
Dec. 31, 2010
Short term marketable securities $ 372 $ 509
Available-for-sale securities 4,233  
Financial instrument liabilities 1,251  
Debt 2,661  
Quoted Prices In Active Markets For Identical Assets (Level 1)
   
Short term marketable securities 372  
Available-for-sale securities 4,042  
Financial instrument liabilities 1,147  
Significant Other Observable Inputs (Level 2)
   
Available-for-sale securities 191  
Financial instrument liabilities 104  
Debt $ 2,661