Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 5,660	$ 6,019
Total freight revenues	5,527	5,752
Total other revenues	133	267
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	1,970	1,867
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,432	1,476
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,360	1,380
Coal
Disaggregation of Revenue [Line Items]
Revenues	765	1,029
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	16	131
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 117	$ 136