Reconciliation Of Income Taxes at Federal Statutory Rate to Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Tax Rate Reconciliation [Line Items]
Federal tax computed at the statutory rate	$ 160	$ 40	$ (102)
State taxes, net of Federal benefit	(20)	5	1
Foreign income taxed at rates other than Federal		6	8
Increase (decrease) in valuation allowance	(349)	(46)	85
Non-deductible Merger expenses		11
Other non-deductible expenses	3	4	13
Non-taxable income and additional deductible expenses	(13)	(2)	(2)
Change in unrecognized tax benefits	(3)
Tax expense from intercompany transactions		6
Subpart F and dividend income, net of foreign tax credits	2	1	2
Other items, net		(2)	(3)
Income tax expense (benefit)	$ (220)	$ 23	$ 2