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Revenues - Schedule of Revenues Disaggregated by Lines of Business (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]
Revenue	$ 3,587	$ 3,619	$ 10,584	$ 11,001
Total Merchandise
Disaggregation of Revenue [Line Items]
Revenue	2,208	2,231	6,617	6,712
Chemicals
Disaggregation of Revenue [Line Items]
Revenue	697	727	2,096	2,142
Agricultural and Food Products
Disaggregation of Revenue [Line Items]
Revenue	382	416	1,208	1,229
Automotive
Disaggregation of Revenue [Line Items]
Revenue	306	301	897	930
Forest Products
Disaggregation of Revenue [Line Items]
Revenue	247	259	746	790
Minerals
Disaggregation of Revenue [Line Items]
Revenue	226	202	625	583
Metals and Equipment
Disaggregation of Revenue [Line Items]
Revenue	224	208	657	658
Fertilizers
Disaggregation of Revenue [Line Items]
Revenue	126	118	388	380
Intermodal
Disaggregation of Revenue [Line Items]
Revenue	527	509	1,511	1,521
Coal
Disaggregation of Revenue [Line Items]
Revenue	490	553	1,428	1,748
Trucking
Disaggregation of Revenue [Line Items]
Revenue	207	214	620	650
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 155	$ 112	$ 408	$ 370

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