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Nature of Operations - Schedule of Freight and Other Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 24,250 $ 24,119 $ 24,875
Fuel 2,474 2,891 3,439
Depreciation 2,398 2,318 2,246
Other income, net (350) (491) (426)
Interest expense 1,269 1,340 1,271
Income tax expense 2,047 1,854 2,074
Net income 6,747 6,379 6,998
Total freight revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 22,811 22,571 23,159
Reportable Segment      
Disaggregation of Revenue [Line Items]      
Total operating revenues 24,250 24,119 24,875
Operating 6,795 6,729 6,212
Administrative 757 761 700
Fuel 2,418 2,815 3,321
Other segment items 2,169 2,414 2,479
Depreciation 2,398 2,318 2,246
Other income, net (350) (491) (426)
Interest expense 1,269 1,340 1,271
Income tax expense 2,047 1,854 2,074
Net income 6,747 6,379 6,998
Reportable Segment | Total freight revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 22,811 22,571 23,159
Reportable Segment | Bulk      
Disaggregation of Revenue [Line Items]      
Total operating revenues 7,207 7,358 7,537
Reportable Segment | Industrial      
Disaggregation of Revenue [Line Items]      
Total operating revenues 8,440 8,238 8,205
Reportable Segment | Premium      
Disaggregation of Revenue [Line Items]      
Total operating revenues 7,164 6,975 7,417
Reportable Segment | Other subsidiary revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 788 872 884
Reportable Segment | Accessorial revenues      
Disaggregation of Revenue [Line Items]      
Total operating revenues 554 584 779
Reportable Segment | Other      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 97 $ 92 $ 53