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Legal Proceedings and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended	74 Months Ended	102 Months Ended
	Jun. 28, 2015	Jun. 28, 2015	Jun. 28, 2015	Dec. 31, 2014	Apr. 24, 2009
Legal Proceedings And Contingencies [Line Items]
Liabilities recorded relative to environmental matters	$ 955	$ 955	$ 955	$ 965
Environmental costs eligible for future recovery	$ 827	827	827	836
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	$ 2,600	2,600	2,600	2,400
Third-party guarantees outstanding	$ 1,100	$ 1,100	$ 1,100	$ 774
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures	90.00%	90.00%	90.00%	85.00%
N.Y. Metropolitan Transportation Authority
Legal Proceedings And Contingencies [Line Items]
Contract value					$ 323
Contract payments received to date	$ 241	$ 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%	50.00%
Dividends that are subject to contingency			$ 527
Revolving line of credit	$ 560	$ 560	$ 560

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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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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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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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