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Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 03, 2021
Sep. 27, 2020
Oct. 03, 2021
Sep. 27, 2020
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 339 $ 330 $ 1,019 $ 979
Interest cost 192 238 578 715
Expected return on plan assets (661) (617) (1,988) (1,839)
Amortization of prior service cost/(credit) (46) 0 (136) 1
Recognized actuarial losses 314 224 944 669
Curtailments and settlements 0 0 1 19
Net periodic benefit cost 138 175 418 544
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 78 72 232 216
Interest cost 20 33 61 99
Expected return on plan assets (1) (2) (5) (5)
Amortization of prior service cost/(credit) (8) (7) (23) (23)
Recognized actuarial losses 38 36 113 107
Curtailments and settlements 0 0 0 0
Net periodic benefit cost $ 127 $ 132 $ 378 $ 394