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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total $ 12,123 $ 12,156 $ 12,745
Merchandise      
Disaggregation of Revenue [Line Items]      
Total 7,470 7,353 7,331
Merchandise | Agriculture, forest and consumer products      
Disaggregation of Revenue [Line Items]      
Total 2,521 2,530 2,493
Merchandise | Chemicals      
Disaggregation of Revenue [Line Items]      
Total 2,123 2,054 2,148
Merchandise | Metals and construction      
Disaggregation of Revenue [Line Items]      
Total 1,682 1,634 1,652
Merchandise | Automotive      
Disaggregation of Revenue [Line Items]      
Total 1,144 1,135 1,038
Intermodal      
Disaggregation of Revenue [Line Items]      
Total 3,042 3,090 3,681
Coal      
Disaggregation of Revenue [Line Items]      
Total $ 1,611 $ 1,713 $ 1,733