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Legal Proceedings and Contingencies - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 26, 2016	Apr. 30, 2015	Mar. 27, 2016	Dec. 31, 2015	Apr. 24, 2009
Legal Proceedings And Contingencies [Line Items]
Damages sought by plaintiff		$ 45,000,000
Statutory penalty		13,000,000
Total damages		$ 148,000,000
Payment related to agreement	$ 5,000,000
Liabilities recorded relative to environmental matters			$ 991,000,000	$ 1,000,000,000
Environmental costs eligible for future recovery			$ 849,000,000	858,000,000
Time period environmental costs and recovery of environmental costs are projected over, years			20 years
Percentage of expenditures that are reimbursed for certain remediation activities			50.00%
Outstanding letters of credit, surety bonds, and third-party guarantees			$ 3,700,000,000	3,800,000,000
Third-party guarantees outstanding			$ 669,000,000	$ 678,000,000
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures			79.00%	79.00%
Lockheed Martin Energy Systems Incorporated
Legal Proceedings And Contingencies [Line Items]
Total damages	500,000
Lockheed Martin Utility Services Incorporated
Legal Proceedings And Contingencies [Line Items]
Total damages	500,000
Defendant
Legal Proceedings And Contingencies [Line Items]
Payment related to agreement	$ 4,000,000
United Launch Alliance
Legal Proceedings And Contingencies [Line Items]
Percentage of ownership interest in affiliated entity			50.00%
Inventory supply agreement			$ 120,000,000
N.Y. Metropolitan Transportation Authority
Legal Proceedings And Contingencies [Line Items]
Damages sought by plaintiff			190,000,000
Contract value					$ 323,000,000
Contract payments received to date			241,000,000
Claims for monetary damages against the plaintiff			$ 95,000,000