Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 5,968	$ 5,401
Total freight revenues	5,626	5,110
Total other revenues	342	291
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	2,084	1,890
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,356	1,308
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,297	1,226
Coal
Disaggregation of Revenue [Line Items]
Revenues	889	686
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	191	180
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 151	$ 111