Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Amount of unrecognized tax benefits that may favorably effect the effective income tax rate	$ 17	$ 15	$ 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	22	20	50
Additions based on tax positions related to current year	6	1	3
Additions based on tax positions related to prior years	3	10	17
Reductions based on tax positions related to prior years	(1)	(3)	(41)
Settlements with taxing authorities	0	(5)	0
Lapse of statute of limitations	(6)	(1)	(9)
Balance at end of the year	$ 24	$ 22	$ 20