Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule Of Financial Instruments Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details)

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Financial Instruments (Schedule Of Financial Instruments Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) (Auction Rate Securities [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Auction Rate Securities [Member]
   
Financial Instrument [Line Items]    
Beginning balance $ 38 $ 57
Redemption at par (6)   
Ending balance $ 32 $ 57