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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2014
Mar. 29, 2013
Net periodic pension and other Postretirement benefit cost    
Contributions to pension plan $ 157 $ 558
Pension plans, anticipated additional contributions for remainder of current fiscal year 18  
Pension Benefits
   
Net periodic pension and other Postretirement benefit cost    
Service cost 67 69
Interest cost 101 94
Expected return on plan assets (178) (164)
Amortization of prior service cost (credit) (1) (1)
Amortization of net actuarial loss 18 50
Total cost (credit) recognized in statements of income 7 48
Other Benefits
   
Net periodic pension and other Postretirement benefit cost    
Service cost 6 9
Interest cost 11 11
Expected return on plan assets (3) (2)
Amortization of prior service cost (credit) (4) (3)
Amortization of net actuarial loss 1 3
Total cost (credit) recognized in statements of income $ 11 $ 18