Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		69 Months Ended
	Feb. 06, 2015	Jan. 01, 2016	Jan. 02, 2015	Jan. 01, 2016	Jan. 02, 2015	Sep. 30, 2012	Aug. 31, 2015	Jan. 31, 2014
Loss Contingencies [Line Items]
Net revenues		$ 909	$ 970	$ 2,727	$ 3,057
GSA Schedule Contract
Loss Contingencies [Line Items]
Net revenues						$ 222
GSA initial analysis of damage exposure								$ 145
Current estimate of the low end of the range of estimated loss		$ 25		$ 25
Intellectual Ventures (IV) vs. Symantec | Judicial Ruling
Loss Contingencies [Line Items]
Damages awarded	$ 8
Class Action Lawsuit vs. Symantec, Extended Download Services and Norton Download Insurance
Loss Contingencies [Line Items]
Accrual for settlement							$ 30