Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 6,640	$ 5,809	$ 12,608	$ 11,210
Total freight revenues	6,295	5,474	11,921	10,584
Total other revenues	345	335	687	626
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	2,450	2,083	4,533	3,973
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,388	1,272	2,745	2,580
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,458	1,352	2,755	2,578
Coal
Disaggregation of Revenue [Line Items]
Revenues	999	767	1,888	1,453
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	186	200	377	380
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 159	$ 135	$ 310	$ 246