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Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020	Jan. 03, 2021
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	$ 1,083
Derivatives designated as hedging instruments : Liabilities	1,105
Available-for-sale Securities, Equity Securities	1,452		$ 1,481
Available-for-sale Securities	14,493		14,042
Contingent consideration	600		633
Total Gross Assets	1,134		1,138
Credit Support Agreement (CSA)	(1,028)		(1,107)
Total Net Asset	106		31
Total Gross Liabilities	1,148		2,309
Credit Support Agreement (CSA)	(1,130)		(2,172)
Total Net Liabilities	18		137
Beginning Balance	633	$ 1,715
Changes in estimated fair value (6)	15	(977)
Additions	0	106
Payments	(48)	(60)
Ending Balance	600	784
Contingent consideration reversal	0	(983)
Quoted prices in active markets for identical assets and liabilities Level 1
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Available-for-sale Securities, Equity Securities	1,452		1,481
Available-for-sale Securities	0
Contingent consideration	0
Significant other observable inputs Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	1,083		1,089
Derivatives designated as hedging instruments : Liabilities	1,105		2,271
Available-for-sale Securities, Equity Securities	0
Available-for-sale Securities	14,493
Contingent consideration	0
Significant unobservable inputs Level 3
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Available-for-sale Securities, Equity Securities	0
Available-for-sale Securities	0
Contingent consideration	600		633
Interest Rate Contract
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	522
Derivatives designated as hedging instruments : Liabilities	540
Interest Rate Contract | Quoted prices in active markets for identical assets and liabilities 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 Contract | Significant other observable inputs Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	522		240
Derivatives designated as hedging instruments : Liabilities	540		1,569
Interest Rate Contract | Significant unobservable inputs Level 3
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	0
Derivatives designated as hedging instruments : Liabilities	0
Forward foreign exchange contracts
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	561
Derivatives designated as hedging instruments : Liabilities	565
Derivatives not designated as hedging instruments : Assets	51
Derivatives not designated as hedging instruments : Liabilities	43
Forward foreign exchange contracts | Quoted prices in active markets for identical assets and liabilities 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
Forward foreign exchange contracts | Significant other observable inputs Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	561		849
Derivatives designated as hedging instruments : Liabilities	565		702
Derivatives not designated as hedging instruments : Assets	51		49
Derivatives not designated as hedging instruments : Liabilities	43		38
Forward foreign exchange contracts | Significant unobservable inputs 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
Auris Health
Financial assets and liabilities at fair value
Contingent consideration reversal		$ (983)
Other Noncurrent Liabilities | Auris Health
Financial assets and liabilities at fair value
Contingent consideration	589		594
Other Current Liabilities
Financial assets and liabilities at fair value
Contingent consideration	$ 11		$ 39

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