Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	Dec. 29, 2019	Dec. 30, 2018
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 925	$ 694
Derivative Asset, Fair Value, Gross Liability	(841)	(423)
Financial assets and liabilities at fair value
Derivative assets	84	271
Derivative Instruments in Hedges, Assets, at Fair Value	902
Derivative liabilities	66	267
Derivative Instruments in Hedges, Liabilities, at Fair Value	619
Equity Securities, FV-NI	1,148	511
Debt securities	4,368	9,734
Derivative Liability, Fair Value, Gross Liability	652	872
Derivative Liability, Fair Value, Gross Asset	(586)	(605)
Business Combination, Contingent Consideration, Liability	1,715	397
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	1,148	511
Debt securities	0
Level 2
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	902	662
Derivative Instruments in Hedges, Liabilities, at Fair Value	619	840
Equity Securities, FV-NI	0
Debt securities	4,368
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
Business Combination, Contingent Consideration, Liability	1,715	397
Interest rate swaps contracts:
Financial assets and liabilities at fair value
Derivative Instruments in Hedges, Assets, at Fair Value	693
Derivative Instruments in Hedges, Liabilities, at Fair Value	193
Non-current assets included in interest rate contracts	1	6
Non-current liabilities included in interest rate contracts		3
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	693	161
Derivative Instruments in Hedges, Liabilities, at Fair Value	193	292
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
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	23
Derivative Instruments in Hedges, Assets, at Fair Value	209
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	33
Derivative Instruments in Hedges, Liabilities, at Fair Value	426
Foreign exchange contracts | Level 1
Financial assets and liabilities at fair value
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	0
Derivative Instruments in Hedges, Assets, at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Foreign exchange contracts | Level 2
Financial assets and liabilities at fair value
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	23	32
Derivative Instruments in Hedges, Assets, at Fair Value	209	501
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	33	32
Derivative Instruments in Hedges, Liabilities, at Fair Value	426	$ 548
Foreign exchange contracts | Level 3
Financial assets and liabilities at fair value
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	0
Derivative Instruments in Hedges, Assets, at Fair Value	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	$ 0