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Financial Instruments and Risk Management (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Foreign exchange risk [Abstract]      
Maximum term of currency derivative instruments (in years) 1    
Notional amounts of open foreign exchange forward contracts and option contracts $ 268,000,000   $ 356,000,000
Investments in marketable securities 150,000,000   653,000,000
Fair values of other financial assets and liabilities [Abstract]      
Marketable securities 150,000,000   653,000,000
Interest rate risk [Abstract]      
Aggregate fixed rate debt 4,800,000,000   3,800,000,000
Number of debt instruments with related interest rate swaps   2  
Notional amounts of interest rate swaps   1,000,000,000  
Floating rate basis LIBOR-based    
Weighted average floating rate 3.57%    
Aggregate fixed rate debt after effect of interest rate swaps 3,800,000,000    
Aggregate floating rate debt after effect of interest rate swaps 1,000,000,000    
Carrying Value [Member]
     
Fair values of other financial assets and liabilities [Abstract]      
Long-term debt 4,800,000,000   3,800,000,000
Fair Value [Member]
     
Fair values of other financial assets and liabilities [Abstract]      
Long-term debt 6,200,000,000   4,600,000,000
Quoted Prices in Active Markets for Identical Assets or Liabilities [Member]
     
Fair values of other financial assets and liabilities [Abstract]      
Long-term debt 3,600,000,000   4,200,000,000
Significant Observable Inputs for Similar Assets or Liabilities [Member]
     
Fair values of other financial assets and liabilities [Abstract]      
Long-term debt $ 2,600,000,000   $ 422,000,000