Commitments and Contingencies (Lease Commitments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013
Operating Leased Assets [Line Items]
Maximum lease term (up to)	30 years
Operating Leases [Abstract]
2016	$ 76
2017	69
2018	55
2019	53
2020	35
Thereafter	167
Total	455
Sublease Income [Abstract]
2016	(3)
2017	(3)
2018	(2)
2019	(2)
2020	(2)
Thereafter	(8)
Total	(20)
Net Lease Commitments [Abstract]
2016	73
2017	66
2018	53
2019	51
2020	33
Thereafter	159
Total	435
Rent Expense on Operating Leases [Member]
Operating Leases, Rent Expense, Net [Abstract]
Rent Expense on Operating Leases	$ 66	$ 61	$ 60