Related Parties and Affiliates - Schedule of Related Party in the Consolidated Income Statement Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Amounts Consolidated Income Statements [Abstract]
Equity Earnings of Affiliates	$ (91)	$ (96)	$ (219)
Corporate Joint Venture | Conrail | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Rents, fees and services	119	117	120
Purchase price amortization and other	4	4	4
Equity Earnings of Affiliates	(42)	(43)	(58)
Total	81	78	66
Affiliated Entity | TTX | Materials, Supplies and Other
Related Party Amounts Consolidated Income Statements [Abstract]
Car hire rents	223	223	237
Equity Earnings of Affiliates	(56)	(60)	(157)
Total	$ 167	$ 163	$ 80