v3.26.3
Operations and Segmentation - Freight and Other Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 7,197 $ 6,244 $ 20,278 $ 18,425
Locomotive fuel 1,040 616 2,621 1,956
Depreciation 643 618 1,914 1,841
Other income, net (95) (96) (291) (297)
Interest expense 312 327 945 984
Income tax expense 650 530 1,740 1,468
Net income 2,076 1,788 5,770 5,290
Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,813 5,927 19,224 17,461
Reportable Segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 7,197 6,244 20,278 18,425
Operating 1,841 1,711 5,301 5,080
Administrative 186 176 553 557
Locomotive fuel 1,013 600 2,556 1,754
Acquisition-related (Note 18) 22 41 93 42
Other segment items 549 549 1,697 1,706
Depreciation 643 618 1,914 1,841
Other income, net (95) (96) (291) (297)
Interest expense 312 327 945 984
Income tax expense 650 530 1,740 1,468
Net income 2,076 1,788 5,770 5,290
Reportable Segment | Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,813 5,927 19,224 17,461
Reportable Segment | Bulk        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,116 1,930 6,185 5,667
Reportable Segment | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,509 2,194 7,086 6,488
Reportable Segment | Premium        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,188 1,803 5,953 5,306
Reportable Segment | Other subsidiary revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 201 172 570 547
Reportable Segment | Accessorial revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 157 124 412 349
Reportable Segment | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 26 $ 21 $ 72 $ 68