v3.25.4
Nature of Operations - Schedule of Freight and Other Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 24,510 $ 24,250 $ 24,119
Locomotive fuel 2,390 2,474 2,891
Depreciation 2,465 2,398 2,318
Other income, net (629) (350) (491)
Interest expense 1,309 1,269 1,340
Income tax expense 2,028 2,047 1,854
Net income 7,138 6,747 6,379
Total freight revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 23,220 22,811 22,571
Reportable Segment      
Disaggregation of Revenue [Line Items]      
Total operating revenues 24,510 24,250 24,119
Operating 6,816 6,793 6,727
Administrative 735 760 763
Locomotive fuel 2,335 2,418 2,815
Acquisition-related (Note 20) 72 0 0
Other segment items 2,241 2,168 2,414
Depreciation 2,465 2,398 2,318
Other income, net (629) (350) (491)
Interest expense 1,309 1,269 1,340
Income tax expense 2,028 2,047 1,854
Net income 7,138 6,747 6,379
Reportable Segment | Total freight revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 23,220 22,811 22,571
Reportable Segment | Bulk      
Disaggregation of Revenue [Line Items]      
Total operating revenues 7,586 7,207 7,358
Reportable Segment | Industrial      
Disaggregation of Revenue [Line Items]      
Total operating revenues 8,604 8,440 8,238
Reportable Segment | Premium      
Disaggregation of Revenue [Line Items]      
Total operating revenues 7,030 7,164 6,975
Reportable Segment | Other subsidiary revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 718 788 872
Reportable Segment | Accessorial revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 475 554 584
Reportable Segment | Other      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 97 $ 97 $ 92