Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Feb. 09, 2017	Aug. 01, 2016
Blue Coat, Inc.
Goodwill [Line Items]
Intangible assets acquired	$ 1,600		$ 1,608
LifeLock
Goodwill [Line Items]
Intangible assets acquired	$ 1,200	$ 1,247