v3.26.1
Operations and Segmentation - Freight and Other Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 6,217 $ 6,027
Locomotive fuel 643 603
Depreciation 633 610
Other income, net (91) (78)
Interest expense 320 322
Income tax expense 528 501
Net income 1,701 1,626
Total freight revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 5,893 5,691
Reportable Segment    
Disaggregation of Revenue [Line Items]    
Total operating revenues 6,217 6,027
Operating 1,719 1,684
Administrative 185 193
Locomotive fuel 630 591
Acquisition-related (Note 17) 36 0
Other segment items 556 578
Depreciation 633 610
Other income, net (91) (78)
Interest expense 320 322
Income tax expense 528 501
Net income 1,701 1,626
Reportable Segment | Total freight revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 5,893 5,691
Reportable Segment | Bulk    
Disaggregation of Revenue [Line Items]    
Total operating revenues 2,026 1,836
Reportable Segment | Industrial    
Disaggregation of Revenue [Line Items]    
Total operating revenues 2,191 2,082
Reportable Segment | Premium    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,676 1,773
Reportable Segment | Other subsidiary revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 175 194
Reportable Segment | Accessorial revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 126 118
Reportable Segment | Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 23 $ 24