Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019	Apr. 01, 2019
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	$ 1,521
Derivatives designated as hedging instruments : Liabilities	511
Available-for-sale Securities, Equity Securities	1,488		$ 1,148
Available-for-sale Securities	10,047		4,368
Total Gross Assets	1,559		925
Credit Support Agreement (CSA)	(1,437)		(841)
Total Net Asset	122		84
Total Gross Liabilities	558		652
Credit Support Agreement (CSA)	(510)		(586)
Total Net Liabilities	48		66
Beginning Balance	796	$ 1,562
Changes in estimated fair value (7)	(938)	35
Additions	106	1,133
Payments	(87)	(3)
Ending Balance	1,715	397
Contingent consideration	796		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	1,488		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	1,521		902
Derivatives designated as hedging instruments : Liabilities	511		619
Available-for-sale Securities, Equity Securities	0
Available-for-sale Securities	10,047
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	796		1,715
Interest Rate Contract
Financial assets and liabilities at fair value
Derivatives designated as hedging instruments : Assets	1,126
Derivatives designated as hedging instruments : Liabilities	251
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	1,126		693
Derivatives designated as hedging instruments : Liabilities	251		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	43,900		45,300
Derivatives designated as hedging instruments : Assets	395
Derivatives designated as hedging instruments : Liabilities	260
Derivatives not designated as hedging instruments : Assets	38
Derivatives not designated as hedging instruments : Liabilities	47
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	395		209
Derivatives designated as hedging instruments : Liabilities	260		426
Derivatives not designated as hedging instruments : Assets	38		23
Derivatives not designated as hedging instruments : Liabilities	47		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	22,200		20,100
Auris Health
Financial assets and liabilities at fair value
Contingent consideration	200			$ 2,350
Contingent consideration reversal	(983)
Other Noncurrent Liabilities
Financial assets and liabilities at fair value
Contingent consideration	169
Other Noncurrent Liabilities | Auris Health
Financial assets and liabilities at fair value
Contingent consideration	793		1,631
Other Current Liabilities
Financial assets and liabilities at fair value
Contingent consideration	$ 3		$ 84