Financial Instruments Tingyi (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Equity Method Investments and Joint Ventures [Abstract]
Tingyi Charge	$ 373	$ 73	$ 0
Tingyi Charge per share	$ 0.26	$ 0.05
indirect equity investment percentage	5.00%
indirect equity investment	$ 166