Legal Proceedings and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended				93 Months Ended
	Sep. 28, 2014	Dec. 31, 2013	Sep. 28, 2014 N.Y. Metropolitan Transportation Authority	Apr. 24, 2009 N.Y. Metropolitan Transportation Authority	Sep. 28, 2014 United Launch Alliance
Legal Proceedings And Contingencies [Line Items]
Contract value				$ 323,000,000
Contract payments received to date			241,000,000
Liabilities recorded relative to environmental matters	963,000,000	997,000,000
Environmental costs eligible for future recovery	834,000,000	863,000,000
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	2,400,000,000	2,400,000,000
Third-party guarantees outstanding	743,000,000	696,000,000
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures	90.00%	90.00%
Percentage of ownership interest in affiliated entity					50.00%
Dividends that are subject to contingency					527,000,000
Revolving line of credit					$ 560,000,000