Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Narrative) (Details)

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Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Financial Instrument [Line Items]    
Available-for-sale investments in money market funds used as collateral $ 10  
Sales of available-for-sale securities 6 13
Realized gain on available-for-sale securities   2
Auction Rate Securities [Member]
   
Financial Instrument [Line Items]    
Available-for-sale Securities, Debt Securities, Current 32  
Par Value [Member] | Auction Rate Securities [Member]
   
Financial Instrument [Line Items]    
Available-for-sale Securities, Debt Securities, Current $ 37