Acquisitions and Divestitures Acquisition and Divestitures (Balance Sheet Disclosures) (Details) - Website Security and Public Key Infrastructure Businesses - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 29, 2017	Dec. 30, 2016	Oct. 31, 2017
Assets:
Cash and cash equivalents					$ 2
Accounts receivable, net					34
Goodwill and intangible assets, net					670
Other assets					40
Total assets					746
Liabilities:
Deferred revenue					285
Other liabilities					11
Total liabilities					$ 296
Divested Operation, Income (Loss) from Divested Operation Disclosures [Abstract]
Divested operations, income before income taxes	$ 8	$ 49	$ 66	$ 157