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Fair Value Measurements (Narrative) (Details) (USD $)
Sep. 29, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in money market mutual funds classified as cash and cash equivalents $ 452,000,000 $ 437,000,000
Long-term debt, Face Value 1,900,000,000  
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, Fair Value $ 2,100,000,000