Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Anti-dilutive potential common shares excluded from reconciliation	7	5	6	5
Common stock repurchased (in shares)			2	7
Common stock repurchased			$ 120	$ 516	$ 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	$ 1,400		$ 1,400