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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. 01, 2023
Oct. 02, 2022
Oct. 01, 2023
Oct. 02, 2022
Retirement Plans        
Components of net periodic benefit cost        
Service cost $ 210 $ 313 $ 638 $ 953
Interest cost 363 226 1,090 685
Expected return on plan assets (680) (683) (2,042) (2,075)
Amortization of prior service cost/(credit) (47) (46) (139) (138)
Recognized actuarial (gains) losses (50) 163 (150) 492
Curtailments and settlements 72 0 72 1
Net periodic benefit cost/(credit) (132) (27) (531) (82)
Other Benefit Plans        
Components of net periodic benefit cost        
Service cost 61 80 198 240
Interest cost 51 26 160 79
Expected return on plan assets (1) (2) (4) (6)
Amortization of prior service cost/(credit) 0 (1) (1) (4)
Recognized actuarial (gains) losses 4 30 17 91
Curtailments and settlements (9) 0 (9) 0
Net periodic benefit cost/(credit) $ 106 $ 133 $ 361 $ 400