Restructuring and Impairment Charges Narrative (Details) - 2014 Productivity Plan [Member] [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 24, 2018	Mar. 25, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 12	$ 27
Restructuring, Settlement and Impairment Provisions, After Tax	$ 11	$ 27
Restructuring, Settlement and Impairment Provisions, Net of Tax, Per Share Amount	$ 0.01	$ 0.02