Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Dec. 29, 2019	Apr. 01, 2019
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	$ 1,247
Derivatives designated as hedging instruments : Liabilities	709
Available-for-sale Securities, Equity Securities	1,140		$ 1,148
Available-for-sale Securities	13,391		4,368
Total Gross Assets	1,311		925
Credit Support Agreement (CSA)	(1,117)		(841)
Total Net Asset	194		84
Total Gross Liabilities	765		652
Credit Support Agreement (CSA)	(737)		(586)
Total Net Liabilities	28		66
Beginning Balance	636	$ 1,638
Changes in estimated fair value (7)	(1,088)	117
Additions	107	1,133
Payments	(98)	(9)
Ending Balance	1,715	397
Contingent consideration	636		1,715
Contingent consideration reversal	(1,148)	$ 0
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	1,140		1,148
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	1,247		902
Derivatives designated as hedging instruments : Liabilities	709		619
Available-for-sale Securities, Equity Securities	0
Available-for-sale Securities	13,391
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	636		1,715
Interest Rate Contract
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	635
Derivatives designated as hedging instruments : Liabilities	382
Derivative Assets, Noncurrent			1
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	635		693
Derivatives designated as hedging instruments : Liabilities	382		193
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
Derivative, Notional Amount	43,600		45,300
Derivatives designated as hedging instruments : Assets	612
Derivatives designated as hedging instruments : Liabilities	327
Derivatives not designated as hedging instruments : Assets	64
Derivatives not designated as hedging instruments : Liabilities	56
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	612		209
Derivatives designated as hedging instruments : Liabilities	327		426
Derivatives not designated as hedging instruments : Assets	64		23
Derivatives not designated as hedging instruments : Liabilities	56		33
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
Cross currency interest rate swaps
Financial assets and liabilities at fair value
Derivative, Notional Amount	26,500		20,100
Auris Health
Financial assets and liabilities at fair value
Contingent consideration				$ 2,350
Contingent consideration reversal	(1,148)
Other Noncurrent Liabilities | Auris Health
Financial assets and liabilities at fair value
Contingent consideration	608		1,631
Other Current Liabilities
Financial assets and liabilities at fair value
Contingent consideration	$ 28		$ 84