Employee Benefit Plans (Amounts Recorded in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions		Dec. 25, 2015	Dec. 26, 2014
Pension Benefits [Member]
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets	[1]	$ 9	$ 9
Current Liabilities		(15)	(15)
Long-term Liabilities		(545)	(492)
Net Amount Recognized in Consolidated Balance Sheets		(551)	(498)
Post-retirement Benefits [Member]
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets		0	0
Current Liabilities		(36)	(37)
Long-term Liabilities		(278)	(303)
Net Amount Recognized in Consolidated Balance Sheets		$ (314)	$ (340)

[1] Long-term assets as of December 2015 and 2014 relate to one of the qualified pension plans whose assets exceed projected benefit obligations.