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Financial Instruments (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Derivatives, Fair Value [Line Items]    
Percentage of revenue from outside operations, net 50.00%  
Specified percentage of revenue from total outside operations, net 23.00%  
Debt instrument, fair value $ 29,800,000,000 $ 25,900,000,000
Foreign Exchange Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Expected reclassification of net gains (losses) related to hedge from accumulated OCI into net income within the next 12 months 20,000,000  
Foreign currency derivatives at face value, net 2,300,000,000 1,700,000,000
Interest Rate Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Expected reclassification of net gains (losses) related to hedge from accumulated OCI into net income within the next 12 months (16,000,000)  
Notional amount of interest rate derivatives 8,330,000,000 9,230,000,000
Percentage of total debt, net of related interest rate derivatives, exposed to variable interest rates 38.00% 43.00%
Commodity Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Expected reclassification of net gains (losses) related to hedge from accumulated OCI into net income within the next 12 months (59,000,000)  
Face value of open commodity derivative contracts qualifying for hedging 598,000,000 590,000,000
Derivative asset not designated as hedging instrument, face value $ 630,000,000 $ 266,000,000