Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 5,739	$ 5,828	$ 11,399	$ 11,847
Total freight revenues	5,594	5,570	11,121	11,322
Total other revenues	145	258	278	525
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	2,122	1,895	4,092	3,762
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,423	1,292	2,855	2,768
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,441	1,447	2,801	2,827
Coal
Disaggregation of Revenue [Line Items]
Revenues	608	936	1,373	1,965
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	22	124	38	255
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 123	$ 134	$ 240	$ 270