Acquisition and Divestitures - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions			2 Months Ended	3 Months Ended	12 Months Ended
	Jan. 26, 2016	Nov. 06, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquisitions And Divestitures [Line Items]
Acquisitions of businesses and investments in affiliates					$ 9,003	$ 898	$ 269
Proceeds from borrowings under revolving credit facilities					6,000
Proceeds from Issuance of Commercial Paper				$ 1,000
Proceeds from issuance of fixed interest-rate long-term notes					9,101
Cash tax benefit, estimated net present value		$ 1,900
Aggregate amount of goodwill arising from acquisitions			$ 13,576	13,576	13,576	10,862	10,348	[1]
Non-recoverable transaction costs					45
Costs associated with issuance of fixed interest-rate long-term notes					95	27
Income tax charge related to historic earnings of foreign subsidiaries			353	353	353	291	222
Amortization of intangible assets					116	49	48
Net earnings from discontinued operations							$ 31
Subsequent Event | 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
Sikorsky Aircraft Corporation
Acquisitions And Divestitures [Line Items]
Acquisitions of businesses and investments in affiliates		9,003
Cash on hand		2,000
Proceeds from Issuance of Commercial Paper		$ 1,000		1,000
Acquired intangible assets, weighted average period of amortization		15 years
Customer contractual obligations		$ 480
Customer contractual obligations due in 2016		85
Customer contractual obligations due in 2017		90
Customer contractual obligations due in 2018		65
Customer contractual obligations due in 2019		60
Customer contractual obligations due in 2020		60
Customer contractual obligations due after 2020		110
Aggregate amount of goodwill arising from acquisitions		2,764
Net sales			400
Operating profit			(45)
Costs associated with issuance of fixed interest-rate long-term notes			48
Sikorsky Aircraft Corporation | Unaudited Supplemental Pro Forma Financial Information
Acquisitions And Divestitures [Line Items]
Increase in interest expense, net of tax					109	121
Sikorsky Aircraft Corporation | Pro Forma Adjustment
Acquisitions And Divestitures [Line Items]
Pension curtailment loss					72
Income tax charge related to historic earnings of foreign subsidiaries			58	58	58
Amortization of intangible assets					125	148
Interest expense, debt					$ 42	$ 48
Sikorsky Aircraft Corporation | Three Hundred And Sixty Four Day Revolving Credit Facility And Five Year Revolving Credit Facility
Acquisitions And Divestitures [Line Items]
Proceeds from borrowings under revolving credit facilities		$ 6,000
Non-recoverable transaction costs			$ 38
Sikorsky Aircraft Corporation | November 2015 Notes
Acquisitions And Divestitures [Line Items]
Proceeds from issuance of fixed interest-rate long-term notes				$ 7,000
Business Acquisitions
Acquisitions And Divestitures [Line Items]
Acquired intangible assets, weighted average period of amortization						8 years	8 years
Aggregate amount of goodwill arising from acquisitions						$ 657	$ 175
Aggregate amount allocated to other intangibles arising from acquisitions						$ 223	$ 34

[1] Includes reclassifications of goodwill among our business segments as a result of our program realignment, which occurred during the fourth quarter of 2015 (Note 1).