Revenues - Disaggregated by Lines of Business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 14,657	$ 14,853	$ 12,522
Total Merchandise
Disaggregation of Revenue [Line Items]
Revenue	8,653	8,239	7,539
Chemicals
Disaggregation of Revenue [Line Items]
Revenue	2,599	2,584	2,421
Agricultural and Food Products
Disaggregation of Revenue [Line Items]
Revenue	1,657	1,664	1,461
Automotive
Disaggregation of Revenue [Line Items]
Revenue	1,219	1,054	886
Forest Products
Disaggregation of Revenue [Line Items]
Revenue	1,012	996	918
Metals and Equipment
Disaggregation of Revenue [Line Items]
Revenue	917	828	796
Minerals
Disaggregation of Revenue [Line Items]
Revenue	733	658	587
Fertilizers
Disaggregation of Revenue [Line Items]
Revenue	516	455	470
Coal
Disaggregation of Revenue [Line Items]
Revenue	2,484	2,434	1,790
Intermodal
Disaggregation of Revenue [Line Items]
Revenue	2,060	2,306	2,039
Trucking
Disaggregation of Revenue [Line Items]
Revenue	882	966	410
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 578	$ 908	$ 744