Noncontrolling Interest (Schedule Of Change In Ownership Interest) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Noncontrolling Interest [Abstract]
Net income attributable to Symantec Corporation stockholders	$ 193	$ 182	$ 365	$ 373
Decrease in Symantec Corporation stockholders' paid-in capital for purchase of 166,821 VeriSign Japan common shares	(30)		(30)
Net transfers to noncontrolling interest	(30)		(30)
Change from net income attributable to Symantec Corporation stockholders and transfers to noncontrolling interest	$ 163	$ 182	$ 335	$ 373