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Amount of damages awarded to the plaintiff in the legal matter.

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Commitments and Contingencies (Details) $ in Millions			3 Months Ended		6 Months Ended		69 Months Ended
Commitments and Contingencies (Details) $ in Millions	Aug. 04, 2015 USD ($) patent	Aug. 28, 2013 patent	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 30, 2012 USD ($)	Aug. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Net revenues			$ 979	$ 906	$ 1,863	$ 1,818
GSA Schedule Contract
Loss Contingencies [Line Items]
Net revenues							$ 222
GSA initial analysis of damage exposure									$ 145
GSA Schedule Contract \| Minimum
Loss Contingencies [Line Items]
Current estimate of the low end of the range of estimated loss			25		25
Class Action Lawsuit vs. Symantec, Extended Download Services and Norton Download Insurance
Loss Contingencies [Line Items]
Accrual for settlement								$ 30
Finjan, Inc vs. Blue Coat Systems, Inc. \| Pending Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed \| patent		6
Finjan, Inc vs. Blue Coat Systems, Inc. \| Judicial Ruling
Loss Contingencies [Line Items]
Current estimate of the low end of the range of estimated loss			$ 40		$ 40
Number of patents found infringed \| patent	5
Damages awarded	$ 40