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Revenues - Revenues Disaggregated by Lines of Business (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 3,681 | $ 3,706
Total Merchandise |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,185 | 2,163
Chemicals |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 693 | 650
Agricultural and Food Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 407 | 437
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 293 | 274
Forest Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 262 | 261
Metals and Equipment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 220 | 239
Minerals |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 174 | 173
Fertilizers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 136 | 129
Coal |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 632 | 633
Intermodal |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 506 | 499
Trucking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 215 | 233
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 143 | $ 178

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