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Fair Value Measurements and Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 5,820 $ 5,484
Carrying Value [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 5,607 $ 5,176