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Retirement Plans (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Pension Benefits
   
Amounts recognized in our balance sheets    
Non-current assets $ 61 $ 54
Current liabilities (26) (23)
Non-current liabilities (1,373) (1,343)
Recognized in Accumulated other comprehensive loss, pre-tax :    
Net loss 2,750 2,455
Prior service cost (credit) 113 129
Postretirement Benefits Other than Pensions
   
Amounts recognized in our balance sheets    
Current liabilities (52) (56)
Non-current liabilities (512) (505)
Recognized in Accumulated other comprehensive loss, pre-tax :    
Net loss 99 91
Prior service cost (credit) $ (41) $ (50)