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Effective Income Tax Rate, Forecasted, Percent

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Potential Future Cash Outflow for Payments of Income Taxes and Interest

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 02, 2015	Dec. 27, 2013	Jan. 02, 2015	Dec. 27, 2013	Mar. 30, 2012
Income Taxes [Line Items]
Effective tax rate	29.00%	27.00%	26.00%	21.00%
Ownership in the joint venture with Huawei					49.00%
Income tax expense (benefit)	$ 90us-gaap_IncomeTaxExpenseBenefit	$ 104us-gaap_IncomeTaxExpenseBenefit	$ 248us-gaap_IncomeTaxExpenseBenefit	$ 177us-gaap_IncomeTaxExpenseBenefit
Effective tax rate, forecasted	28.00%	29.00%	28.00%	29.00%
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, lower bound	30		30
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	150		150
Amount on deposit with the IRS pertaining to US Tax matters in the Symantec 2009-2013 audit cycles	127		127
Tax Settlements And Lapse Of Statutes Of Limitations
Income Taxes [Line Items]
Decrease in tax expense	8	2	28	13
Extension of Research and Development Tax Credit
Income Taxes [Line Items]
Decrease in tax expense	2		2
Foreign Operations
Income Taxes [Line Items]
Decrease in tax expense		7		7
Sale Of Short Term Investments
Income Taxes [Line Items]
Income tax expense (benefit)				12
Minimum
Income Taxes [Line Items]
Unrecognized tax benefits that could affect effective tax rate	15		15
Reasonably possible additional cash payments	15		15
Maximum
Income Taxes [Line Items]
Unrecognized tax benefits that could affect effective tax rate	70		70
Reasonably possible additional cash payments	65		65
Joint Venture with Huawei \| Tax Settlements And Lapse Of Statutes Of Limitations
Income Taxes [Line Items]
Decrease in tax expense				33
Tax Years 2005 through 2008
Income Taxes [Line Items]
Decrease in tax expense				$ 24