Acquisition and Divestitures - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions			3 Months Ended
	Jan. 26, 2016	Nov. 06, 2015	Mar. 27, 2016	Mar. 29, 2015	Dec. 31, 2015
Acquisitions And Divestitures [Line Items]
Goodwill			$ 13,583		$ 13,576
Amortization of intangible assets			69	$ 22
Leidos
Acquisitions And Divestitures [Line Items]
One-time special cash receipt	$ 1,800
Outstanding equity to be received by stockholders, percentage	50.50%
Outstanding equity to be received by stockholders, shares	77
Outstanding equity to be received by stockholders, value	$ 3,200
Dividend payable by Leidos to Leidos shareholders	$ 1,000
Leidos common shares issued	77
Sikorsky Aircraft Corporation
Acquisitions And Divestitures [Line Items]
Acquisitions of businesses and investments in affiliates		$ 9,000
Inventories			(49)
Deferred income tax assets			11
Customer advances and amounts in excess of costs incurred			10
Intangible assets weighted-average useful life		15 years
Customer contractual obligations		$ 480
Customer contractual obligations remaining in 2016			52
Customer contractual obligations due in 2017			96
Customer contractual obligations due in 2018			68
Customer contractual obligations due in 2019			59
Customer contractual obligations due in 2020			59
Customer contractual obligations due in 2021			56
Customer contractual obligations due after 2021			59
Customer contractual obligations current			31
Goodwill		$ 2,764
Sikorsky Aircraft Corporation | Pro Forma Adjustment
Acquisitions And Divestitures [Line Items]
Amortization of intangible assets				36
Interest expense, debt				$ 43
Sikorsky Aircraft Corporation | Customer Programs
Acquisitions And Divestitures [Line Items]
Intangible assets			(28)
Sikorsky Aircraft Corporation | Trademarks
Acquisitions And Divestitures [Line Items]
Intangible assets			$ 71