Other Income - Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 30, 2016	Dec. 25, 2015
Other Income and Expenses [Abstract]
Interest Income	$ 13	$ 10	$ 6
Income from Non-operating Real Estate Activities	0	27	83
Miscellaneous Income (Expense)	8	9	9
Total Other Income (Expense) - Net	21	46	98
Gross Revenue from Real Estate Operations included above	$ 0	$ 56	$ 104