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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Net periodic pension and other Postretirement benefit cost    
Contributions to pension plan $ 43 $ 493
Pension plans, anticipated additional contributions for remainder of current fiscal year $ 56  
Pension Benefits    
Net periodic pension and other Postretirement benefit cost    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 8.00%  
Service cost $ 50 59
Interest cost 78 80
Expected return on plan assets (161) (164)
Amortization of prior service cost (credit) 0 0
Amortization of net actuarial loss 44 46
Net periodic benefit cost (credit) 11 21
Special termination benefits 18 8
Total cost recognized in statements of income $ 29 29
Other Benefits    
Net periodic pension and other Postretirement benefit cost    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 4.50%  
Service cost $ 5 5
Interest cost 8 8
Expected return on plan assets (3) (3)
Amortization of prior service cost (credit) (5) (5)
Amortization of net actuarial loss 2 2
Net periodic benefit cost (credit) 7 7
Special termination benefits 0 0
Total cost recognized in statements of income $ 7 $ 7