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SEGMENT INFORMATION - Summary of Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Total sales $ 2,610 $ 2,497  
Cost of sales (1,710) (1,682)  
Gross profit 900 815  
Selling, general and administrative expenses (307) (281)  
Engineering expenses (46) (48)  
Amortization expense (73) (74)  
Income from operations 474 412  
Interest expense and other, net (48) (49)  
Income before income taxes 426 363  
Depreciation and amortization 120 123  
Capital expenditures 44 31  
Segment assets 19,096 18,747 $ 18,702
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales (20) (24)  
Corporate Activities and Elimination      
Segment Reporting Information [Line Items]      
Total sales 0 0  
Cost of sales 0 0  
Gross profit 0 0  
Selling, general and administrative expenses (36) (30)  
Engineering expenses 0 0  
Amortization expense 0 0  
Income from operations (36) (30)  
Interest expense and other, net (48) (49)  
Income before income taxes (84) (79)  
Depreciation and amortization 3 4  
Capital expenditures 3 1  
Segment assets 1,727 1,493  
Freight Segment      
Segment Reporting Information [Line Items]      
Total sales 1,901 1,824  
Freight Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Total sales 1,901 1,824  
Cost of sales (1,216) (1,199)  
Gross profit $ 685 $ 625  
Gross margin 36.00% 34.30%  
Selling, general and administrative expenses $ (164) $ (150)  
Engineering expenses (36) (39)  
Amortization expense (65) (68)  
Income from operations 420 368  
Interest expense and other, net 0 0  
Income before income taxes 420 368  
Depreciation and amortization 97 103  
Capital expenditures 31 17  
Segment assets 13,224 13,316  
Freight Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales 11 13  
Transit Segment      
Segment Reporting Information [Line Items]      
Total sales 709 673  
Transit Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Total sales 709 673  
Cost of sales (494) (483)  
Gross profit $ 215 $ 190  
Gross margin 30.30% 28.20%  
Selling, general and administrative expenses $ (107) $ (101)  
Engineering expenses (10) (9)  
Amortization expense (8) (6)  
Income from operations 90 74  
Interest expense and other, net 0 0  
Income before income taxes 90 74  
Depreciation and amortization 20 16  
Capital expenditures 10 13  
Segment assets 4,145 3,938  
Transit Segment | Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total sales $ 9 $ 11