Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Net periodic pension and other Postretirement benefit cost    
Contributions to pension plan $ 78 $ 157
Pension plans, anticipated additional contributions for remainder of current fiscal year 17  
Pension Benefits    
Net periodic pension and other Postretirement benefit cost    
Service cost 67 67
Interest cost 95 101
Expected return on plan assets (177) (178)
Amortization of prior service cost (credit) 0 (1)
Amortization of net actuarial loss 49 18
Total cost (credit) recognized in statements of income 34 7
Other Benefits    
Net periodic pension and other Postretirement benefit cost    
Service cost 7 6
Interest cost 9 11
Expected return on plan assets (3) (3)
Amortization of prior service cost (credit) (5) (4)
Amortization of net actuarial loss 3 1
Total cost (credit) recognized in statements of income $ 11 $ 11