Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense Recognized In Our Condensed Consolidated Statements Of Income) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 29, 2012	Jul. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 38	$ 39
Tax benefit associated with stock-based compensation expense	(10)	(11)
Net stock-based compensation expense	28	28
Net stock-based compensation expense per share attributable to Symantec Corporation stockholders- basic	$ 0.04	$ 0.04
Net stock-based compensation expense per share attributable to Symantec Corporation stockholders- diluted	$ 0.04	$ 0.04
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	4	5
Sales And Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	16	15
Research And Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	11	11
General And Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 7	$ 8