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Noncontrolling Interest (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 6 Months Ended
Jul. 06, 2012
Sep. 28, 2012
Sep. 28, 2012
Veri Sign Japan [Member]
Mar. 30, 2012
Veri Sign Japan [Member]
Subsequent Event [Line Items]        
Symantec's ownership interest     92.00% 54.00%
Amount Paid To Acquire Shares $ 92 $ 92    
Common stock and stock rights shares acquired 166,821      
Remaining interest to be acquired in fiscal 2013   8.00%