Acquisition (Schedule of Pro Forma Information) (Details) - Blue Coat, Inc. - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Business Acquisition [Line Items]
Net revenues	$ 1,023	$ 1,041	$ 2,086	$ 2,078
Net income (loss)	$ (158)	$ 40	$ (119)	$ 0