Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 6,010	$ 5,904	$ 17,445	$ 17,303
Total freight revenues	5,837	5,743	16,963	16,864
Total other revenues	173	161	482	439
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	2,121	2,121	6,126	6,213
Agricultural and Energy Products
Disaggregation of Revenue [Line Items]
Revenues	1,628	1,532	4,810	4,647
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	1,293	1,295	3,782	3,836
Coal
Disaggregation of Revenue [Line Items]
Revenues	795	795	2,245	2,168
Non-rail logistics subsidiary
Disaggregation of Revenue [Line Items]
Revenues	21	23	55	61
Accessorial and other
Disaggregation of Revenue [Line Items]
Revenues	$ 152	$ 138	$ 427	$ 378