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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 03, 2016
Mar. 29, 2015
Retirement Plans    
Components of net periodic benefit cost    
Service cost $ 226 $ 248
Interest cost 233 249
Expected return on plan assets (492) (455)
Amortization of prior service cost/(credit) 1 0
Recognized actuarial losses 124 187
Curtailments and settlements 1 4
Net periodic benefit cost 93 233
Other Benefit Plans    
Components of net periodic benefit cost    
Service cost 55 64
Interest cost 40 47
Expected return on plan assets (2) (2)
Amortization of prior service cost/(credit) (8) (8)
Recognized actuarial losses 34 50
Curtailments and settlements 0 0
Net periodic benefit cost $ 119 $ 151