Contingencies (Details 3) (Self Insured Property And Casualty Reserves [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013
Self Insured Property And Casualty Reserves [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 142	$ 140	$ 128
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)	47	58
Payments	$ (61)	$ (56)