Earnings Per Share (Schedule Of Components Of Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 28, 2013		Jun. 29, 2012
Earnings Per Share [Line Items]
Net income	$ 157		$ 160
Net income per share attributable to Symantec Corporation stockholders-basic	$ 0.23		$ 0.22
Net income per share attributable to Symantec Corporation stockholders-diluted	$ 0.22		$ 0.22
Weighted average outstanding common shares attributable to Symantec Corporation stockholders-basic	697		716
Dilutive potential shares issuable from assumed exercise of stock options	3		1
Dilutive potential shares related to stock award plans	7		3
Total weighted-average shares outstanding attributable to Symantec Corporation stockholders-diluted	707		720
Anti-Dilutive Weighted-Average Stock Options [Member]
Earnings Per Share [Line Items]
Anti-dilutive weighted-average shares	4	[1]	32	[1]
Anti-Dilutive Weighted-Average Restricted Stock [Member]
Earnings Per Share [Line Items]
Anti-dilutive weighted-average shares	1	[1]	6	[1]

[1] See Note 5 for information regarding the effects of the 1.00% notes, and the warrants issued and the option purchased in connection with the 1.00% notes.