Acquisitions, Divestitures, Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 business	Dec. 31, 2011 business
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Number of businesses acquired		7	6
Business acquisitions, net of cash acquired	$ 1	$ 444	$ 1,560
Other Income [Member]
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Pretax gain on sale of detection systems reported in other income		$ 38