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Contingencies (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Self Insured Property And Casualty Reserves [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 102 $ 116
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) 42 39
Payments (46) (53)
Ending balance 98 $ 102
Guarantee of Indebtedness of Others    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Loss contingency, amount of guarantee $ 6