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Operations and Segmentation - Schedule of Freight and Other Revenues (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]        
Total operating revenues $ 6,244 $ 6,091 $ 18,425 $ 18,129
Locomotive fuel 616 610 1,795 1,893
Depreciation 618 602 1,841 1,792
Other income, net (96) (87) (297) (282)
Interest expense 327 314 984 957
Income tax expense 530 518 1,468 1,528
Net income 1,788 1,671 5,290 4,985
Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 5,927 5,768 17,461 17,022
Reportable Segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 6,244 6,091 18,425 18,129
Operating 1,711 1,727 5,080 5,066
Administrative 176 184 557 564
Locomotive fuel 600 595 1,754 1,850
Acquisition-related (Note 18) 41 0 42 0
Other segment items 549 567 1,706 1,669
Depreciation 618 602 1,841 1,792
Other income, net (96) (87) (297) (282)
Interest expense 327 314 984 957
Income tax expense 530 518 1,468 1,528
Net income 1,788 1,671 5,290 4,985
Reportable Segment | Total freight revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 5,927 5,768 17,461 17,022
Reportable Segment | Bulk        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,930 1,805 5,667 5,343
Reportable Segment | Industrial        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,194 2,121 6,488 6,348
Reportable Segment | Premium        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,803 1,842 5,306 5,331
Reportable Segment | Other subsidiary revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 172 179 547 608
Reportable Segment | Accessorial revenues        
Disaggregation of Revenue [Line Items]        
Total operating revenues 124 122 349 427
Reportable Segment | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 21 $ 22 $ 68 $ 72