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Retirement Plans (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Pension Benefits
 
Amortized amount from accumulated other comprehensive income  
Net actuarial loss $ 184
Prior service cost (credit) 15
Net periodic benefit cost 199
Postretirement Benefits Other than Pensions
 
Amortized amount from accumulated other comprehensive income  
Net actuarial loss 7
Prior service cost (credit) (11)
Net periodic benefit cost $ (4)