Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015	Jan. 02, 2016	Dec. 31, 2015	Feb. 28, 2014
Equity, Class of Treasury Stock [Line Items]
Anti-dilutive potential common shares excluded from reconciliation	3	3	2	2
Common stock repurchased (in shares)			5	4
Common stock repurchased			$ 386	$ 285	$ 731
Treasury stock
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)			5		11
Common stock repurchased			$ 386		$ 731
February 2014 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount							$ 1,500
December 2015 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount						$ 1,500