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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total net sales $ 7,822 $ 7,556 $ 8,200
Income (loss) from operations 876 745 663
Interest expense and other, net (139) (188) (216)
Income (loss) before income taxes 737 557 447
Depreciation and amortization 491 473 401
Capital expenditures 130 136 186
Segment assets 18,454 18,454  
Freight Segment      
Segment Reporting Information [Line Items]      
Total net sales 5,239 5,082 5,441
Transit Segment      
Segment Reporting Information [Line Items]      
Total net sales 2,583 2,474 2,759
Operating Segments | Freight Segment      
Segment Reporting Information [Line Items]      
Total net sales 5,287 5,131 5,501
Income (loss) from operations 717 584 643
Interest expense and other, net 0 0 0
Income (loss) before income taxes 717 584 643
Depreciation and amortization 405 393 330
Capital expenditures 79 70 105
Segment assets 18,291 15,393  
Operating Segments | Transit Segment      
Segment Reporting Information [Line Items]      
Total net sales 2,616 2,511 2,782
Income (loss) from operations 238 230 214
Interest expense and other, net 0 0 0
Income (loss) before income taxes 238 230 214
Depreciation and amortization 70 67 62
Capital expenditures 48 40 64
Segment assets 5,768 6,395  
Corporate Activities and Elimination      
Segment Reporting Information [Line Items]      
Total net sales (81) (86) (83)
Income (loss) from operations (79) (69) (194)
Interest expense and other, net (139) (188) (216)
Income (loss) before income taxes (218) (257) (410)
Depreciation and amortization 16 13 9
Capital expenditures 3 26 17
Segment assets (5,605) (3,334)  
Corporate Activities and Elimination | Freight Segment      
Segment Reporting Information [Line Items]      
Total net sales 48 49 60
Corporate Activities and Elimination | Transit Segment      
Segment Reporting Information [Line Items]      
Total net sales $ 33 $ 37 $ 23