Related Parties and Affiliates - Schedule of Related Party in the Consolidated Income Statement Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 30, 2016
Related Party Amounts Consolidated Income Statements [Abstract]
Equity Earnings of Affiliates	$ (96)	$ (219)	$ (50)
Corporate Joint Venture | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Rents, fees and services	117	120	114
Purchase price amortization and other	4	4	4
Equity Earnings of Affiliates	(43)	(58)	(37)
Total	78	66	81
TTX Company | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Car hire rents	223	237	233
Equity Earnings of Affiliates	(60)	(157)	(26)
Total	$ 163	$ 80	$ 207