Segment and Geographical Information (Schedule of Product Revenue Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 28, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 1,211	$ 1,209	$ 3,542	$ 3,624
Total Enterprise Security
Segment Reporting Information [Line Items]
Net revenues	609	625	1,739	1,957
Endpoint and information protection
Segment Reporting Information [Line Items]
Net revenues	260	240	769	722
Network and web security
Segment Reporting Information [Line Items]
Net revenues	207	215	567	592
Website security and public key infrastructure
Segment Reporting Information [Line Items]
Net revenues	0	35	0	238
Other products and services
Segment Reporting Information [Line Items]
Net revenues	142	135	403	405
Total Consumer Digital Safety
Segment Reporting Information [Line Items]
Net revenues	602	584	1,803	1,667
Consumer security
Segment Reporting Information [Line Items]
Net revenues	367	370	1,104	1,120
Identity and information protection
Segment Reporting Information [Line Items]
Net revenues	$ 235	$ 214	$ 699	$ 547