Acquisition (Schedule of Preliminary Fair Values of the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Aug. 01, 2016	Apr. 01, 2016	[1]
Assets
Goodwill	$ 7,232		$ 3,148
Blue Coat, Inc.
Assets
Accounts receivable		$ 125
Other current assets		65
Property and equipment		54
Intangibles		1,608
Goodwill		4,086
Other long-term assets		9
Total assets acquired		5,947
Liabilities
Deferred revenue		144
Other current liabilities		111
Long-term deferred revenue		76
Long-term deferred tax liabilities		924
Other long-term obligations		19
Total liabilities assumed		1,274
Total purchase price		$ 4,673

[1] Derived from audited financial statements.