Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended			21 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 31, 2017
Derivative [Line Items]
Foreign currency translation	$ 1,696	$ (612)	$ (3,632)
Deferred net losses (gains) on derivatives included in accumulated other comprehensive income	$ 70			$ 70
Description of Reclassification of Cash Flow Hedge Gain (Loss)	next 12 months
Maximum length of time for hedging transaction exposure	18 months
Other income/(expense), net, related to foreign exchange contracts, non hedging	$ (5)	(56)
Foreign exchange contracts
Derivative [Line Items]
Collateral paid	162			162
Derivative, notional amount	34,500	36,000		34,500
Cross currency interest rate swaps
Derivative [Line Items]
Derivative, notional amount	2,300	2,300		2,300
Interest Rate Contract
Derivative [Line Items]
Derivative, notional amount	1,100	1,800		1,100
Equity Contract
Derivative [Line Items]
Derivative, notional amount		$ 300
Other Comprehensive Income (Loss)
Derivative [Line Items]
Foreign currency translation	$ (597)			$ (222)