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Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Retirement Plans    
Components of net periodic benefit cost    
Service cost $ 251 $ 226
Interest cost 230 233
Expected return on plan assets (505) (492)
Amortization of prior service cost/(credit) 0 1
Recognized actuarial losses 152 124
Curtailments and settlements 0 1
Net periodic benefit cost 128 93
Other Benefit Plans    
Components of net periodic benefit cost    
Service cost 61 55
Interest cost 39 40
Expected return on plan assets (2) (2)
Amortization of prior service cost/(credit) (7) (8)
Recognized actuarial losses 34 34
Curtailments and settlements 0 0
Net periodic benefit cost $ 125 $ 119