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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2014
Nov. 30, 2014
Apr. 03, 2015
Mar. 28, 2014
Mar. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance     98,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance    
Stock-based compensation     $ 195us-gaap_AllocatedShareBasedCompensationExpense $ 156us-gaap_AllocatedShareBasedCompensationExpense $ 164us-gaap_AllocatedShareBasedCompensationExpense
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum payroll deduction withheld     10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Purchase price of common stock as a percentage of fair market value     85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Award purchase period     6 months    
Stock issued under employee stock purchase plan     25,000,000us-gaap_SharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Shares reserved for issuance     45,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
2000 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum retainer allowable     100.00%symc_MaximumRetainerAllowable
/ us-gaap_AwardTypeAxis
= symc_TwoThousandEquityIncentivePlanMember
   
Stock issued under equity based awards plan (in shares)     135,000symc_SharesIssuedForEmployeeEquityAwardsPlans
/ us-gaap_AwardTypeAxis
= symc_TwoThousandEquityIncentivePlanMember
   
Remaining shares available for future issuance (in shares)     65,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= symc_TwoThousandEquityIncentivePlanMember
   
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period, years 4 years 3 years      
Weighted-average fair value per grant (in dollars per share)     $ 22.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 23.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 15.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total fair value of RSUs vested     133us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
147us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
124us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total unrecognized compensation cost adjusted for estimated forfeitures     368us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Weighted-average period in years over which stock based compensation cost is expected to be recognized     2 years 6 months    
Number of share granted     18,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Number of unvested shares     26,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
19,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
2013 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance     45,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= symc_TwoThousandThirteenEquityIncentivePlanMember
   
Remaining shares available for future issuance (in shares)     24,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= symc_TwoThousandThirteenEquityIncentivePlanMember
   
PRUs and PCSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= symc_PerformanceBasedRestrictedStockUnitsandPerformanceContingentStockUnitsMember
13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= symc_PerformanceBasedRestrictedStockUnitsandPerformanceContingentStockUnitsMember
13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= symc_PerformanceBasedRestrictedStockUnitsandPerformanceContingentStockUnitsMember
PRUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average fair value per grant (in dollars per share)     $ 26.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
$ 26.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
$ 16.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Total unrecognized compensation cost adjusted for estimated forfeitures     $ 18us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Weighted-average period in years over which stock based compensation cost is expected to be recognized     1 year 9 months 18 days    
Number of share granted     2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Number of unvested shares     2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
PCSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of share granted     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= symc_PerformanceContingentStockUnits1Member
   
Number of unvested shares     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= symc_PerformanceContingentStockUnits1Member
   
Common Stock | 2000 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized and reserved for issuance     200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= symc_TwoThousandEquityIncentivePlanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember