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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
Jul. 04, 2021
Jun. 28, 2020
Jul. 04, 2021
Jun. 28, 2020
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 327 $ 323 $ 680 $ 649
Interest cost 193 237 386 477
Expected return on plan assets (647) (608) (1,327) (1,222)
Amortization of prior service cost/(credit) (45) 1 (90) 1
Recognized actuarial losses 316 222 630 445
Curtailments and settlements 0 0 1 19
Net periodic benefit cost 144 175 280 369
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 77 72 154 144
Interest cost 21 33 41 66
Expected return on plan assets (2) (1) (4) (3)
Amortization of prior service cost/(credit) (7) (8) (15) (16)
Recognized actuarial losses 37 35 75 71
Curtailments and settlements 0 0 0 0
Net periodic benefit cost $ 126 $ 131 $ 251 $ 262