Acquisitions, Intangible Assets And Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012 Segment	Dec. 31, 2012 Segment
Goodwill and Intangible Assets Disclosure [Abstract]
Number of businesses acquired				2	7
Acquisition of business, aggregate value			$ 1	$ 165	$ 444
Amortization expense	42	58	89	115
Annual amortization expense	$ 165		$ 165