Acquisitions Fiscal 2016 Purchase Price Allocation (Details) - USD ($) $ in Millions	Apr. 01, 2016	Feb. 26, 2016	Sep. 24, 2015	Sep. 17, 2015	Apr. 03, 2015	[1]	Mar. 28, 2014
Business Acquisition [Line Items]
Goodwill	$ 1,277				$ 838		$ 879
UXC Limited
Business Acquisition [Line Items]
Accounts receivable and other current assets		$ 125
Deferred tax asset, long-term		15
Property and equipment and other non-current assets		20
Accounts payable		(32)
Accrued payroll and other current liabilities		(22)
Accrued expenses and other current liabilities		(32)
Deferred revenue		(23)
Debt		(45)
Deferred tax liability, long-term		(37)
Other long-term liabilities		(12)
Total identifiable net assets acquired		48
Goodwill		254
Total estimated consideration		302
Fixnetix, Limited
Business Acquisition [Line Items]
Accounts receivable and other current assets			$ 13
Property and equipment and other non-current assets			8
Trade payables, accrued expenses and deferred revenue			(26)
Leases and other long-term liabilities			(6)
Deferred tax liability, net			(2)
Total identifiable net assets acquired			35
Goodwill	$ 2		77
Total estimated consideration			112
Fruition Partners
Business Acquisition [Line Items]
Accounts receivable and other current assets				$ 19
Deferred tax asset, long-term				3
Property and equipment and other non-current assets				1
Trade payables, accrued expenses and deferred revenue				(12)
Deferred tax liability, net				(8)
Total identifiable net assets acquired				47
Goodwill				103
Total estimated consideration				150
Developed Technology Rights | UXC Limited
Business Acquisition [Line Items]
Finite-lived intangible asset acquired		4
Developed Technology Rights | Fixnetix, Limited
Business Acquisition [Line Items]
Finite-lived intangible asset acquired			4
Developed Technology Rights | Fruition Partners
Business Acquisition [Line Items]
Finite-lived intangible asset acquired				7
Customer relationships | UXC Limited
Business Acquisition [Line Items]
Finite-lived intangible asset acquired		74
Noncompete Agreements | Fruition Partners
Business Acquisition [Line Items]
Finite-lived intangible asset acquired				2
Customer Relationships and Trade Names | Fixnetix, Limited
Business Acquisition [Line Items]
Finite-lived intangible asset acquired			$ 44
Customer Relationships and Trade Names | Fruition Partners
Business Acquisition [Line Items]
Finite-lived intangible asset acquired				$ 35
Trade names | UXC Limited
Business Acquisition [Line Items]
Finite-lived intangible asset acquired		$ 13

[1] Certain prior year balances were adjusted to give effect to discontinued operations as described in Note 4, for certain errors in previously issued financial statements related to income taxes as described in Note 1, and for the retrospective application of ASU 2015-17 and ASU 2016-09 as described in Note 1.