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Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 277 $ 309 $ 553 $ 618
Interest cost 274 249 549 501
Expected return on plan assets (581) (554) (1,164) (1,114)
Amortization of prior service cost/(credit) 1 0 2 1
Recognized actuarial losses 146 213 290 428
Curtailments and settlements 8 0 7 (2)
Net periodic benefit cost 125 217 237 432
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 69 68 137 135
Interest cost 46 38 92 75
Expected return on plan assets (1) (2) (3) (4)
Amortization of prior service cost/(credit) (8) (8) (16) (16)
Recognized actuarial losses 33 31 65 61
Curtailments and settlements 0 0 0 0
Net periodic benefit cost $ 139 $ 127 $ 275 $ 251