Goodwill and Identifiable Intangible Assets - Amortization Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 25, 2015	Sep. 26, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization Expense	$ 10	$ 11	$ 29	$ 32