Segment and Geographical Information (Schedule of Product Revenue Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 1,175	$ 1,240	$ 2,331	$ 2,415
Total Enterprise Security
Segment Reporting Information [Line Items]
Net revenues	574	686	1,130	1,332
Endpoint and information protection
Segment Reporting Information [Line Items]
Net revenues	256	245	509	482
Network and web security
Segment Reporting Information [Line Items]
Net revenues	187	205	360	377
Website security and public key infrastructure
Segment Reporting Information [Line Items]
Net revenues	0	100	0	203
Other products and services
Segment Reporting Information [Line Items]
Net revenues	131	136	261	270
Total Consumer Digital Safety
Segment Reporting Information [Line Items]
Net revenues	601	554	1,201	1,083
Consumer security
Segment Reporting Information [Line Items]
Net revenues	368	379	737	750
Identity and information protection
Segment Reporting Information [Line Items]
Net revenues	$ 233	$ 175	$ 464	$ 333