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Legal Proceedings and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	77 Months Ended
	Sep. 27, 2015	Dec. 31, 2014	Sep. 27, 2015	Apr. 24, 2009
Legal Proceedings And Contingencies [Line Items]
Liabilities recorded relative to environmental matters	$ 976	$ 965	$ 976
Environmental costs eligible for future recovery	$ 847	836	847
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	$ 2,700	2,400	2,700
Third-party guarantees outstanding	$ 1,000	$ 774	1,000
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures	89.00%	85.00%
N.Y. Metropolitan Transportation Authority
Legal Proceedings And Contingencies [Line Items]
Contract value				$ 323
Contract payments received to date	$ 241		241
Damages sought by plaintiff			190
Claims for monetary damages against the plaintiff			$ 95
United Launch Alliance
Legal Proceedings And Contingencies [Line Items]
Percentage of ownership interest in affiliated entity	50.00%		50.00%
Inventory supply agreement	$ 120		$ 120

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Total contract value.

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Counterclaim for damages sought for the current period.

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The aggregate total amount of outstanding letters of credit, surety bonds, and third-party guarantees.

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Approximate percentage of expenditures to be reimbursed for certain remediation activities.

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Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures to which we currently are or previously were a party.

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Time period environmental costs and recovery of environmental costs are projected over.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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