Fair value measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	$ 1,527
Derivatives designated as hedging instruments : Liabilities	5,962
Equity investments	4,473	$ 576
Debt securities	8,874	10,487
Contingent Consideration	1,092	1,120
Total Gross Assets	1,591	2,201
Credit Support Agreements (CSA)	$ (1,575)	$ (2,176)
Derivative Asset, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Total Net Asset	Total Net Asset
Total Net Asset	$ 16	$ 25
Total Gross Liabilities	6,037	3,357
Credit Support Agreements (CSA)	$ (5,604)	$ (3,023)
Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Total Net Liabilities	Total Net Liabilities
Total Net Liabilities	$ 433	$ 334
Beginning Balance	1,120	533	$ 633
Changes in estimated fair value	29	(194)	(52)
Additions	0	792	0
Payments/Other	(57)	(11)	(48)
Ending Balance	1,092	1,120	533
Other Noncurrent Liabilities
Financial assets and liabilities at fair value
Contingent Consideration	1,092	1,116	520
Other Current Liabilities
Financial assets and liabilities at fair value
Contingent Consideration		4	$ 13
Abiomed
Financial assets and liabilities at fair value
Contingent Consideration	704
Level 1
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Equity investments	4,473	576
Debt securities	0
Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	1,527	2,163
Derivatives designated as hedging instruments : Liabilities	5,962	3,289
Equity investments	0
Debt securities	8,874
Level 3
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Equity investments	0
Debt securities	0
Contingent Consideration	1,092	1,120
Foreign exchange contracts
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	539
Derivatives designated as hedging instruments : Liabilities	624
Derivatives not designated as hedging instruments : Assets	64
Derivatives not designated as hedging instruments : Liabilities	75
Foreign exchange contracts | Level 1
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Derivatives not designated as hedging instruments : Assets	0
Derivatives not designated as hedging instruments : Liabilities	0
Foreign exchange contracts | Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	539	629
Derivatives designated as hedging instruments : Liabilities	624	511
Derivatives not designated as hedging instruments : Assets	64	38
Derivatives not designated as hedging instruments : Liabilities	75	68
Foreign exchange contracts | Level 3
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Derivatives not designated as hedging instruments : Assets	0
Derivatives not designated as hedging instruments : Liabilities	0
Interest rate swaps contracts:
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	988
Derivatives designated as hedging instruments : Liabilities	5,338
Interest rate swaps contracts: | Level 1
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Interest rate swaps contracts: | Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	988	1,534
Derivatives designated as hedging instruments : Liabilities	5,338	$ 2,778
Interest rate swaps contracts: | Level 3
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	$ 0