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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total sales $ 9,677 $ 8,362 $ 7,822
Income (loss) from operations 1,266 1,011 876
Interest expense and other, net (174) (157) (139)
Income before income taxes 1,092 854 737
Depreciation and amortization 531 479 491
Capital expenditures 186 149 130
Segment assets 18,988 18,516  
Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 6,962 6,012 5,239
Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 2,715 2,350 2,583
Corporate Activities and Elimination      
Segment Reporting Information [Line Items]      
Total sales (101) (82) (81)
Income (loss) from operations (94) (84) (79)
Interest expense and other, net (174) (157) (139)
Income before income taxes (268) (241) (218)
Depreciation and amortization 17 20 16
Capital expenditures 9 8 3
Segment assets (10,785) (7,718)  
Corporate Activities and Elimination | Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 60 51 48
Corporate Activities and Elimination | Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 41 31 33
Operating Segments | Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 7,022 6,063 5,287
Income (loss) from operations 1,071 864 717
Interest expense and other, net 0 0 0
Income before income taxes 1,071 864 717
Depreciation and amortization 443 399 405
Capital expenditures 120 87 79
Segment assets 24,674 21,118  
Operating Segments | Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 2,756 2,381 2,616
Income (loss) from operations 289 231 238
Interest expense and other, net 0 0 0
Income before income taxes 289 231 238
Depreciation and amortization 71 60 70
Capital expenditures 57 54 $ 48
Segment assets $ 5,099 $ 5,116