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Financial Instruments and Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Long-term Debt $ 4,776 $ 3,376
Carrying Value [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 4,776 3,376
Fair Value, Inputs, Level 2 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 5,121 $ 3,613