Segment and Geographical Information (Schedule of Product Revenue Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 1,156	$ 1,175
Total Enterprise Security
Segment Reporting Information [Line Items]
Net revenues	556	646
Endpoint and information protection
Segment Reporting Information [Line Items]
Net revenues	253	237
Network and web security
Segment Reporting Information [Line Items]
Net revenues	173	172
Website security and public key infrastructure
Segment Reporting Information [Line Items]
Net revenues	0	103
Other products and services
Segment Reporting Information [Line Items]
Net revenues	130	134
Total Consumer Digital Safety
Segment Reporting Information [Line Items]
Net revenues	600	529
Consumer security
Segment Reporting Information [Line Items]
Net revenues	369	371
Identity and information protection
Segment Reporting Information [Line Items]
Net revenues	$ 231	$ 158