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Pensions and other benefit plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 29, 2024
Dec. 31, 2023
Jan. 01, 2023
Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 948 $ 893 $ 1,319
Interest cost 1,402 1,437 908
Expected return on plan assets (2,560) (2,716) (2,756)
Amortization of prior service cost (184) (184) (184)
Recognized actuarial losses (gains) 174 (199) 650
Curtailments and settlements (2) 93 1
Net periodic benefit cost (credit) (222) (676) (62)
Other Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 277 264 320
Interest cost 209 214 104
Expected return on plan assets (7) (7) (8)
Amortization of prior service cost (2) (2) (5)
Recognized actuarial losses (gains) 53 23 122
Curtailments and settlements 0 (5) 0
Net periodic benefit cost (credit) $ 530 $ 487 $ 533