Revenues - Schedule of Disaggregated by Lines of Business (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	[1]	$ 14,540	$ 14,657	$ 14,853
Total Merchandise
Disaggregation of Revenue [Line Items]
Revenue		8,903	8,653	8,239
Chemicals
Disaggregation of Revenue [Line Items]
Revenue		2,850	2,599	2,584
Agricultural and Food Products
Disaggregation of Revenue [Line Items]
Revenue		1,644	1,657	1,664
Automotive
Disaggregation of Revenue [Line Items]
Revenue		1,226	1,219	1,054
Forest Products
Disaggregation of Revenue [Line Items]
Revenue		1,047	1,012	996
Metals and Equipment
Disaggregation of Revenue [Line Items]
Revenue		859	917	828
Minerals
Disaggregation of Revenue [Line Items]
Revenue		772	733	658
Fertilizers
Disaggregation of Revenue [Line Items]
Revenue		505	516	455
Coal
Disaggregation of Revenue [Line Items]
Revenue		2,247	2,484	2,434
Intermodal
Disaggregation of Revenue [Line Items]
Revenue		2,047	2,060	2,306
Trucking
Disaggregation of Revenue [Line Items]
Revenue		844	882	966
Other
Disaggregation of Revenue [Line Items]
Revenue		$ 499	$ 578	$ 908

[1] See Note 20, Revision of Prior Period Financial Statements