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Financial Instruments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 24, 2012
Dec. 31, 2011
Mar. 19, 2011
Derivatives, Fair Value [Line Items]      
Debt obligations $ 30,000,000,000    
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 (33,000,000)    
Face value of open commodity derivative contracts qualified for hedging 552,000,000   573,000,000
Face value of open commodity derivative contracts not qualified for hedging 628,000,000   300,000,000
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 (9,000,000)    
Foreign currency derivatives at face value, net 2,700,000,000   2,300,000,000
Interest Rate Derivatives [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 (23,000,000)    
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 32.00% 38.00%