Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 26, 2015	Sep. 25, 2015	Sep. 26, 2014	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Change in previously accrued income tax expense including interest and penalties		$ 10
Effective income tax rate excluding goodwill impairment charge and related income tax benefit		22.30%	29.50%
Anticipated decrease in unrecognized tax benefits over the next 12 months		$ 25
Effective income tax benefits	$ 36
Foreign tax benefits related to a legal restructuring	17
Resolution of outstanding income tax matters with U.S. and foreign tax authorities	10
Deferred tax benefits	$ 9	(21)	$ 91
Accrued potential interest included within non-current income taxes payable		18		$ 15
Accrued potential interest included within non-current income taxes payable, after income taxes		11		9
Potential penalties		$ 9		$ 9
NSS [Member]
Operating Loss Carryforwards [Line Items]
Marginal income tax rate on goodwill impairment charge		6.00%