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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. 02, 2023
Jul. 03, 2022
Jul. 02, 2023
Jul. 03, 2022
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 216 $ 319 $ 428 $ 640
Interest cost 373 229 727 459
Expected return on plan assets (694) (693) (1,362) (1,392)
Amortization of prior service cost/(credit) (46) (46) (92) (92)
Recognized actuarial (gains) losses (50) 167 (100) 329
Curtailments and settlements 0 0 0 1
Net periodic benefit cost/(credit) (201) (24) (399) (55)
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 69 80 137 160
Interest cost 55 27 109 53
Expected return on plan assets (2) (2) (3) (4)
Amortization of prior service cost/(credit) (1) (2) (1) (3)
Recognized actuarial (gains) losses 7 31 13 61
Curtailments and settlements 0 0 0 0
Net periodic benefit cost/(credit) $ 128 $ 134 $ 255 $ 267