Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		18 Months Ended
	Oct. 01, 2017	Jan. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017
Derivative [Line Items]
Foreign currency translation	$ 359		$ (94)	$ 1,597	$ 490
Accumulated other comprehensive income on derivatives, after tax	57			$ 57		$ 57
Reclassification of foreign exchange contracts into earnings, period				next 12 months
Maximum length of time for hedge exposure				18 months
Other income/(expense), net, related to foreign exchange contracts, non hedging	$ (12)		$ 35	$ 22	$ (6)
Excess fair value over carrying value of cash and cash equivalents		$ 200
Weighted average interest rate on non-current debt	3.20%			3.20%		3.20%
Excess of the estimated fair value over the carrying value of debt		1,600
Foreign exchange contracts
Derivative [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 43			$ 43		$ 43
Derivative notional amounts outstanding	34,700	36,000		34,700		34,700
Cross currency interest rate swaps
Derivative [Line Items]
Derivative notional amounts outstanding	2,300	2,300		2,300		2,300
Interest Rate Contract
Derivative [Line Items]
Derivative notional amounts outstanding	1,800	1,800		1,800		1,800
Equity Contract
Derivative [Line Items]
Derivative notional amounts outstanding	100	$ 300		100		100
Other Comprehensive Income (Loss) [Member]
Derivative [Line Items]
Foreign currency translation	$ (151)			$ (529)		$ (155)