Revenues - Schedule of Disaggregated by Lines of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 14,092	$ 14,540	$ 14,657
Total Merchandise
Disaggregation of Revenue [Line Items]
Revenue	8,773	8,903	8,653
Chemicals
Disaggregation of Revenue [Line Items]
Revenue	2,776	2,850	2,599
Agricultural and Food Products
Disaggregation of Revenue [Line Items]
Revenue	1,618	1,644	1,657
Automotive
Disaggregation of Revenue [Line Items]
Revenue	1,182	1,226	1,219
Forest Products
Disaggregation of Revenue [Line Items]
Revenue	975	1,047	1,012
Metals and Equipment
Disaggregation of Revenue [Line Items]
Revenue	869	859	917
Minerals
Disaggregation of Revenue [Line Items]
Revenue	832	772	733
Fertilizers
Disaggregation of Revenue [Line Items]
Revenue	521	505	516
Intermodal
Disaggregation of Revenue [Line Items]
Revenue	2,073	2,047	2,060
Coal
Disaggregation of Revenue [Line Items]
Revenue	1,900	2,247	2,484
Trucking
Disaggregation of Revenue [Line Items]
Revenue	816	844	882
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 530	$ 499	$ 578