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Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 255 $ 226 $ 506 $ 452
Interest cost 231 233 461 466
Expected return on plan assets (509) (493) (1,014) (985)
Amortization of prior service cost/(credit) 1 (1) 1 0
Recognized actuarial losses 150 124 302 248
Curtailments and settlements (1) 4 (1) 5
Net periodic benefit cost 127 93 255 186
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 62 55 123 110
Interest cost 40 39 79 79
Expected return on plan assets (1) (1) (3) (3)
Amortization of prior service cost/(credit) (8) (8) (15) (16)
Recognized actuarial losses 35 34 69 68
Curtailments and settlements 0 0 0 0
Net periodic benefit cost $ 128 $ 119 $ 253 $ 238