Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019	Dec. 29, 2019
Derivative [Line Items]
Available-for-sale Securities, Equity Securities	$ 1,140		$ 1,140		$ 1,148
Accumulated other comprehensive income on derivatives, after tax	811		$ 811
Reclassification of foreign exchange contracts into earnings, period			next 12 months
Maximum length of time for hedge exposure			18 months
Unrealized gains on equity investments	$ 1	$ 0	$ 1	$ 1
Weighted average interest rate on non-current debt	2.85%		2.85%
Excess of the estimated fair value over the carrying value of debt					3,000
Current Debt	$ 5,078		$ 5,078		1,202
Reversal of contingent consideration			1,088	(117)
Commercial Paper
Derivative [Line Items]
Current Debt	$ 3,000		$ 3,000
Weighted average interest rate	0.15%		0.15%
Term			1 month 6 days
Forward foreign exchange contracts
Derivative [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 380		$ 380
Derivative, Notional Amount	43,600		43,600		45,300
Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	26,500		26,500		20,100
Interest Rate Contract
Derivative [Line Items]
Derivative Asset, Noncurrent					1
Equity Investments without readily determinable value | Equity Securities
Derivative [Line Items]
Equity, Fair Value Adjustment, Impairment Loss			(48)
Equity, Fair Value Adjustment, Change In Observable Price			12
Equity Securities without Readily Determinable Fair Value, Amount	742		742		$ 712
Changes in Fair Value Reflected in Net Income			(36)
Equity Investments with readily determinable value | Equity Securities
Derivative [Line Items]
Changes in Fair Value Reflected in Net Income			161
Other (income) expense
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0	0	0	0
Fair Value Hedging [Member] | Sales [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Fair Value Hedging [Member] | Cost of Sales [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Fair Value Hedging [Member] | Research and Development Expense [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Fair Value Hedging [Member] | Interest Income Expense Net Member | Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	39	39	118	117
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	39	39	118	117
Fair Value Hedging [Member] | Other (income) expense | Cross currency interest rate swaps
Derivative [Line Items]
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Cash Flow Hedging [Member] | Sales [Member] | Forward foreign exchange contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	3	(8)	10	(43)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	16	(23)	25	(29)
Cash Flow Hedging [Member] | Sales [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Cash Flow Hedging [Member] | Cost of Sales [Member] | Forward foreign exchange contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	(81)	(77)	(316)	(213)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	156	(197)	330	(543)
Cash Flow Hedging [Member] | Cost of Sales [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0		0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Cash Flow Hedging [Member] | Research and Development Expense [Member] | Forward foreign exchange contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	(13)	1,911	(121)	1,808
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	(36)	1,939	(156)	1,847
Cash Flow Hedging [Member] | Research and Development Expense [Member] | Cross currency interest rate swaps
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Cash Flow Hedging [Member] | Interest Income Expense Net Member | Forward foreign exchange contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	0	0	0	0
Cash Flow Hedging [Member] | Interest Income Expense Net Member | Cross currency interest rate swaps
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	84	89	265	207
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	65	159	790	299
Cash Flow Hedging [Member] | Other (income) expense | Forward foreign exchange contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	(8)	1	(10)	9
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	(41)	5	(55)	15
Cash Flow Hedging [Member] | Other (income) expense | Cross currency interest rate swaps
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	$ 0	$ 0	$ 0	$ 0