Related Parties and Affiliates - Schedule of Related Party in the Consolidated Income Statement Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 30, 2016	Dec. 25, 2015
Related Party Amounts Consolidated Income Statements [Abstract]
Equity Earnings of Affiliates	$ (219)	$ (50)	$ (40)
Corporate Joint Venture | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Rents, fees and services	120	114	123
Purchase price amortization and other	4	4	4
Equity Earnings of Affiliates	(58)	(37)	(33)
Total	66	81	94
TTX Company | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Car hire rents	237	233	218
Equity Earnings of Affiliates	(157)	(26)	(20)
Total	$ 80	$ 207	$ 198