Acquisitions and Divestitures - Schedule of Major Classes of Assets and Liabilities Included as Held for Sale (Parenthetical) (Detail) (MSI [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 27, 2015	Dec. 31, 2014
MSI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Billed receivables, allowances	$ 6	$ 6
Impairment loss of assets held for sale	$ 17

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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