Business Combinations - Additional Information (Detail) - USD ($)			1 Months Ended			2 Months Ended	3 Months Ended								12 Months Ended
	Oct. 27, 2014	Sep. 27, 2014	Sep. 30, 2015	Nov. 30, 2014	Oct. 31, 2014	Dec. 31, 2014	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 15, 2014
Business Acquisition [Line Items]
Acquisition related expenses							$ 50,000,000	$ 37,000,000	$ 31,000,000	$ 26,000,000	$ 66,000,000	$ 35,000,000	$ 20,000,000	$ 6,000,000	$ 144,000,000	$ 127,000,000	$ 5,000,000
Increase (Decrease) in Operating Assets															96,000,000
Increase (Decrease) in Operating Liabilities															107,000,000
Goodwill, Translation Adjustments															8,000,000
Opening balance sheet adjustments															3,000,000
Term Loan
Business Acquisition [Line Items]
Business acquisition, borrowings	$ 2,200,000,000.0
Senior Notes
Business Acquisition [Line Items]
Senior notes, stated interest percentage																		7.25%
Enterprise Business
Business Acquisition [Line Items]
Preliminary purchase price	$ 3,450,000,000				$ 3,450,000,000										3,450,000,000
Ownership percentage of the Enterprise Business.	100.00%
Business acquisition, borrowings							3,250,000,000								3,250,000,000
Business acquisition, consideration paid															51,000,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred															(2,000,000)
Acquisition related expenses															144,000,000	127,000,000	5,000,000
Business acquisition goodwill amount	$ 2,339,000,000
Business acquisition intangible assets	994,000,000
Business acquisition indemnifications recorded	$ 20,000,000
Business acquisition, goodwill, expected tax deductible amount							103,000,000								103,000,000
Transition services cost per month				$ 5,000,000
Transition services cost						$ 10,000,000									58,000,000
Reduction in intangible assets			$ 20,000,000
Reduction of property and equipment			3,000,000
Reduction in deferred revenue			1,000,000
Increase in inventory			1,000,000
Increase to goodwill			$ 21,000,000
Enterprise Business | Term Loan
Business Acquisition [Line Items]
Business acquisition, borrowings							2,200,000,000								$ 2,200,000,000
Senior notes, maturity year															2021
Hart Systems LLC
Business Acquisition [Line Items]
Business acquisition goodwill amount																	61,000,000
Business Acquisition Purchase Price Allocations Current Assets Cash And Cash Equivalents																	$ 96,000,000
Goodwill, Translation and Purchase Accounting Adjustments		$ 59,000,000
Opening balance sheet adjustments																$ (2,000,000)
Senior Notes due 2022 | Enterprise Business | Senior Notes
Business Acquisition [Line Items]
Business acquisition, borrowings							$ 1,050,000,000								$ 1,050,000,000
Senior notes, stated interest percentage							7.25%								7.25%
Senior notes, maturity year															2022