Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018	Apr. 01, 2019
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	$ 1,089
Derivative Instruments in Hedges, Liabilities, at Fair Value	2,271
Equity Securities, FV-NI	1,481	$ 1,148
Debt securities	14,042	4,368
Contingent consideration liability	633	1,715
Derivative Asset, Fair Value, Gross Asset	1,138	925
Derivative Asset, Fair Value, Gross Liability	(1,107)	(841)
Derivative Asset	31	84
Derivative Liability, Fair Value, Gross Liability	2,309	652
Derivative Liability, Fair Value, Gross Asset	(2,172)	(586)
Derivative Liability	137	66
Beginning Balance	1,715	397	$ 600
Changes in estimated fair value (7)	(1,089)	151	(156)
Additions	106	1,246	125
Payments	(99)	(79)	(172)
Ending Balance	633	1,715	397
Contingent consideration reversal	(1,148)	0	0
Other Noncurrent Liabilities
Financial assets and liabilities at fair value
Contingent consideration liability	594	1,631	$ 397
Other Current Liabilities
Financial assets and liabilities at fair value
Contingent consideration liability	39	84
Auris Health
Financial assets and liabilities at fair value
Contingent consideration liability	1,100			$ 2,350
Contingent consideration reversal	(1,148)
Level 1
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Equity Securities, FV-NI	1,481	1,148
Debt securities	0
Level 2
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	1,089	902
Derivative Instruments in Hedges, Liabilities, at Fair Value	2,271	619
Equity Securities, FV-NI	0
Debt securities	14,042
Level 3
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Equity Securities, FV-NI	0
Debt securities	0
Contingent consideration liability	633	1,715
Interest rate swaps contracts:
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	240
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,569
Derivative Asset, Noncurrent		1
Interest rate swaps contracts: | Level 1
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Interest rate swaps contracts: | Level 2
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	240	693
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,569	193
Interest rate swaps contracts: | Level 3
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Foreign exchange contracts
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	849
Derivative Instruments in Hedges, Liabilities, at Fair Value	702
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	49
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	38
Foreign exchange contracts | Level 1
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	0
Foreign exchange contracts | Level 2
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	849	209
Derivative Instruments in Hedges, Liabilities, at Fair Value	702	426
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	49	23
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	38	$ 33
Foreign exchange contracts | Level 3
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	$ 0