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Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2012
Sep. 28, 2012
Mar. 29, 2013
Dec. 28, 2012
Veri Sign Japan [Member]
Sep. 28, 2012
Veri Sign Japan [Member]
Mar. 30, 2012
Veri Sign Japan [Member]
Subsequent Event [Line Items]            
Symantec's ownership interest       8.00% 92.00% 54.00%
Amount Paid To Acquire Shares $ 19 $ 92 $ 111