Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Dec. 29, 2019	Apr. 01, 2019
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	$ 2,510
Derivatives designated as hedging instruments : Liabilities	777
Available-for-sale Securities, Equity Securities	826		$ 1,148
Available-for-sale Securities	5,673		4,368
Total Gross Assets	2,630		925
Credit Support Agreement (CSA)	(2,530)		(841)
Total Net Asset	100		84
Total Gross Liabilities	883		652
Credit Support Agreement (CSA)	(531)		(586)
Total Net Liabilities	352		66
Beginning Balance	784	$ 452
Changes in estimated fair value (7)	(977)	32
Additions	106	23
Payments	(60)	0
Ending Balance	1,715	397
Business Combination, Contingent Consideration, Liability	784		1,715
Contingent consideration reversal	(983)	$ 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	826		1,148
Available-for-sale Securities	0
Significant other observable inputs Level 2
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	2,510		902
Derivatives designated as hedging instruments : Liabilities	777		619
Available-for-sale Securities, Equity Securities	0
Available-for-sale Securities	5,673
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
Business Combination, Contingent Consideration, Liability	784		1,715
Interest Rate Contract
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	1,569
Derivatives designated as hedging instruments : Liabilities	247
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	1,569		693
Derivatives designated as hedging instruments : Liabilities	247		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	44,000		45,300
Derivatives designated as hedging instruments : Assets	941
Derivatives designated as hedging instruments : Liabilities	530
Derivatives not designated as hedging instruments : Assets	120
Derivatives not designated as hedging instruments : Liabilities	106
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	941		209
Derivatives designated as hedging instruments : Liabilities	530		426
Derivatives not designated as hedging instruments : Assets	120		23
Derivatives not designated as hedging instruments : Liabilities	106		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	20,100		20,100
Auris Health
Financial assets and liabilities at fair value
Business Combination, Contingent Consideration, Liability	200			$ 2,350
Contingent consideration reversal	(983)
Other Noncurrent Liabilities
Financial assets and liabilities at fair value
Business Combination, Contingent Consideration, Liability	165
Other Noncurrent Liabilities | Auris Health
Financial assets and liabilities at fair value
Business Combination, Contingent Consideration, Liability	759		1,631
Other Current Liabilities
Financial assets and liabilities at fair value
Business Combination, Contingent Consideration, Liability	$ 25		$ 84