Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 5,904	$ 5,847	$ 17,303	$ 17,694
Total freight revenues	5,743	5,592	16,864	16,914
Total other revenues	161	255	439	780
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	2,121	1,982	6,213	5,744
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	1,392	1,220	4,247	3,988
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,435	1,458	4,236	4,285
Coal
Disaggregation of Revenue [Line Items]
Revenues	795	932	2,168	2,897
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	23	128	61	383
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 138	$ 127	$ 378	$ 397