Employee Benefit Plans - Schedule of Amount Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 30, 2016	Dec. 25, 2015
Pension Plans
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets	$ 9	$ 9
Current Liabilities	(15)	(15)
Long-term Liabilities	(326)	(545)
Net Amount Recognized in Consolidated Balance Sheets	(332)	(551)
Post-retirement Medical Plan
Amounts Recorded in Consolidated Balance Sheets [Abstract]
Long-term Assets	0	0
Current Liabilities	(39)	(36)
Long-term Liabilities	(235)	(278)
Net Amount Recognized in Consolidated Balance Sheets	$ (274)	$ (314)