Contingencies (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Self Insured Property And Casualty Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 116	$ 128
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)	39	42
Payments	(53)	(54)
Ending balance	102	$ 116
Guarantee of Indebtedness of Others
Valuation and Qualifying Accounts Disclosure [Line Items]
Loss contingency, amount of guarantee	$ 14