Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013	Dec. 28, 2012	Dec. 30, 2011
Income Tax Disclosure [Abstract]
Amount of unrecognized tax benefits that may favorably effect the effective income tax rate	$ 15	$ 17	$ 15
Amount of unrecognized tax benefits that will be resolved over next twelve months	3
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of the year	24	22	20
Additions based on tax positions related to current year	2	6	1
Additions based on tax positions related to prior years	5	3	10
Reductions based on tax positions related to prior years	(6)	(1)	(3)
Settlements with taxing authorities	0	0	(5)
Lapse of statute of limitations	(2)	(6)	(1)
Balance at end of the year	$ 23	$ 24	$ 22