Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Anti-dilutive potential common shares excluded from reconciliation	9	5	6	5
Common stock repurchased (in shares)			1	6
Common stock repurchased			$ 50	$ 435	$ 516
Common stock repurchases - cash paid			$ 50	390
Accrued Liabilities		$ 45		$ 45
Treasury stock
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)			1		7
Common stock repurchased			$ 50		$ 516
December 2017 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,450		$ 1,450