Acquisitions and Divestitures (Divestiture Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 31, 2017	Dec. 29, 2017	Dec. 30, 2016	Dec. 29, 2017	Dec. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense		$ (606)	$ (5)	$ (683)	$ 45
Website Security and Public Key Infrastructure Businesses | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divested operation, aggregate consideration	$ 1,100
Divested operations, cash received	960
Foreign currency translation gains (losses)	(8)
Income tax expense	137
Transaction costs	8
Gain on sale of short-term investment	$ 7
Website Security and Public Key Infrastructure Businesses | Discontinued Operations, Disposed of by Sale | DigiCert
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divested operation, equity investment, percent interest received	28.00%
Equity investment received as consideration from divestiture	$ 160
Other Operating Income (Expense) | DigiCert
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Income		10		10
Other Expense		$ 2		$ 2