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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total sales $ 8,362 $ 7,822 $ 7,556
Income (loss) from operations 1,011 876 745
Interest expense and other, net (157) (139) (188)
Income before income taxes 854 737 557
Depreciation and amortization 479 491 473
Capital expenditures 149 130 136
Segment assets 18,516 18,454  
Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 6,012 5,239 5,082
Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 2,350 2,583 2,474
Corporate Activities and Elimination      
Segment Reporting Information [Line Items]      
Total sales (82) (81) (86)
Income (loss) from operations (84) (79) (69)
Interest expense and other, net (157) (139) (188)
Income before income taxes (241) (218) (257)
Depreciation and amortization 20 16 13
Capital expenditures 8 3 26
Segment assets (7,718) (5,605)  
Corporate Activities and Elimination | Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 51 48 49
Corporate Activities and Elimination | Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 31 33 37
Operating Segments | Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 6,063 5,287 5,131
Income (loss) from operations 864 717 584
Interest expense and other, net 0 0 0
Income before income taxes 864 717 584
Depreciation and amortization 399 405 393
Capital expenditures 87 79 70
Segment assets 21,118 18,291  
Operating Segments | Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 2,381 2,616 2,511
Income (loss) from operations 231 238 230
Interest expense and other, net 0 0 0
Income before income taxes 231 238 230
Depreciation and amortization 60 70 67
Capital expenditures 54 48 $ 40
Segment assets $ 5,116 $ 5,768