Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Statement of Stockholders' Equity [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 0	$ 4	$ (2)
Pension and post-retirement benefit plans (tax impact)	(57)	69	(115)
Employee Stock Option And SARs Exercises Value, Tax	(43)	(37)	(42)
Stock Issued During Period, Value, Share Based Compensation, Tax	(7)	(5)	(8)
Other Comprehensive income (los), Reclassification Adjustment from AOIC on Derivatives, Tax	$ 1	$ 0	$ (1)