v3.26.1
Operations and Segmentation - Freight and Other Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 6,864 $ 6,154 $ 13,081 $ 12,181
Locomotive fuel 938 576 1,581 1,179
Depreciation 638 613 1,271 1,223
Other income, net (105) (123) (196) (201)
Interest expense 313 335 633 657
Income tax expense 562 437 1,090 938
Net income 1,993 1,876 3,694 3,502
Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,518 5,843 12,411 11,534
Reportable Segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,864 6,154 13,081 12,181
Operating 1,741 1,685 3,460 3,369
Administrative 182 188 367 381
Locomotive fuel 913 563 1,543 1,154
Acquisition-related (Note 18) 35 1 71 1
Other segment items 592 579 1,148 1,157
Depreciation 638 613 1,271 1,223
Other income, net (105) (123) (196) (201)
Interest expense 313 335 633 657
Income tax expense 562 437 1,090 938
Net income 1,993 1,876 3,694 3,502
Reportable Segment | Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,518 5,843 12,411 11,534
Reportable Segment | Bulk        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,043 1,901 4,069 3,737
Reportable Segment | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,386 2,212 4,577 4,294
Reportable Segment | Premium        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,089 1,730 3,765 3,503
Reportable Segment | Other subsidiary revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 194 181 369 375
Reportable Segment | Accessorial revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 129 107 255 225
Reportable Segment | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 23 $ 23 $ 46 $ 47