Employee Benefit Plans (Amounts Recoreded in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2012	Dec. 30, 2011
Pension Plans, Defined Benefit [Member]
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets	$ 3	$ 0
Current Liabilities	(15)	(15)
Long-term Liabilities	(648)	(803)
Net Amount Recognized in Consolidated Balance Sheet	(660)	(818)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets	0	0
Current Liabilities	(41)	(42)
Long-term Liabilities	(374)	(346)
Net Amount Recognized in Consolidated Balance Sheet	$ (415)	$ (388)