Commitments and Contingencies (Lease Commitments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Operating Leased Assets [Line Items]
Maximum lease term	30 years
Operating Leases [Abstract]
2014	$ 79
2015	73
2016	64
2017	55
2018	46
Thereafter	275
Total	592
Sublease Income [Abstract]
2014	(3)
2015	(2)
2016	(2)
2017	(2)
2018	(2)
Thereafter	(13)
Total	24
Net Lease Commitments [Abstract]
2014	76
2015	71
2016	62
2017	53
2018	44
Thereafter	262
Total	568
Rent Expense on Operating Leases [Member]
Operating Leases, Rent Expense, Net [Abstract]
Rent Expense on Operating Leases	$ 60	$ 73	$ 68