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Operations and Segmentation - Schedule of Freight and Other Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 6,027 $ 6,031
Locomotive fuel 603 658
Depreciation 610 594
Other income, net (78) (92)
Interest expense 322 324
Income tax expense 501 499
Net income 1,626 1,641
Total freight revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 5,691 5,616
Reportable Segment    
Disaggregation of Revenue [Line Items]    
Total operating revenues 6,027 6,031
Operating 1,684 1,661
Administrative 193 191
Locomotive fuel 591 645
Other segment items 578 568
Depreciation 610 594
Other income, net (78) (92)
Interest expense 322 324
Income tax expense 501 499
Net income 1,626 1,641
Reportable Segment | Total freight revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 5,691 5,616
Reportable Segment | Bulk    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,836 1,817
Reportable Segment | Industrial    
Disaggregation of Revenue [Line Items]    
Total operating revenues 2,082 2,104
Reportable Segment | Premium    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,773 1,695
Reportable Segment | Other subsidiary revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 194 217
Reportable Segment | Accessorial revenues    
Disaggregation of Revenue [Line Items]    
Total operating revenues 118 174
Reportable Segment | Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 24 $ 24