Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 5,847	$ 6,693	$ 17,694	$ 19,301
Total freight revenues	5,592	6,323	16,914	18,244
Total other revenues	255	370	780	1,057
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	1,982	2,418	5,744	6,951
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,220	1,336	3,988	4,081
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,458	1,468	4,285	4,223
Coal
Disaggregation of Revenue [Line Items]
Revenues	932	1,101	2,897	2,989
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	128	163	383	540
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 127	$ 207	$ 397	$ 517