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Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2023
Jan. 02, 2022
Jan. 03, 2021
Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,327 $ 1,421 $ 1,380
Interest cost 911 770 955
Expected return on plan assets (2,757) (2,645) (2,461)
Amortization of prior service cost (184) (181) 2
Recognized actuarial losses (gains) 655 1,257 891
Curtailments and settlements 1 1 23
Net periodic benefit cost (credit) (47) 623 790
Other Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 320 309 287
Interest cost 105 81 133
Expected return on plan assets (8) (7) (7)
Amortization of prior service cost (5) (31) (31)
Recognized actuarial losses (gains) 121 151 142
Curtailments and settlements 0 0 0
Net periodic benefit cost (credit) $ 533 $ 503 $ 524