Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Statement of Stockholders' Equity [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 20	$ 3	$ 4
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment from AOCI, Tax	0	3	0
Pension and post-retirement benefit plans (tax impact)	5	(57)	69
Employee Stock Option And SARs Exercises Value, Tax	(75)	(43)	(37)
Stock Issued During Period, Value, Share Based Compensation, Tax	(11)	(7)	(5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ (16)	$ 1	$ 0