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Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Retirement Plans    
Components of net periodic benefit cost    
Service cost $ 309 $ 251
Interest cost 252 230
Expected return on plan assets (560) (505)
Amortization of prior service cost/(credit) 1 0
Recognized actuarial losses 215 152
Curtailments and settlements (2) 0
Net periodic benefit cost 215 128
Other Benefit Plans    
Components of net periodic benefit cost    
Service cost 67 61
Interest cost 37 39
Expected return on plan assets (2) (2)
Amortization of prior service cost/(credit) (8) (7)
Recognized actuarial losses 30 34
Curtailments and settlements 0 0
Net periodic benefit cost $ 124 $ 125