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Retirement Plans (Details 5) (USD $)
Dec. 29, 2012
Dec. 31, 2011
Retirement Plans    
Accumulated benefit obligation $ 6,600,000,000 $ 6,000,000,000
Portion of accumulated benefit obligation for unfunded plans 388,000,000 360,000,000
Pension plans with accumulated benefit obligations exceeding the fair value of plan assets    
Projected benefit obligation 6,869,000,000 6,153,000,000
Accumulated benefit obligation 6,404,000,000 5,784,000,000
Fair value of plan assets $ 5,470,000,000 $ 4,786,000,000