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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Integration 3.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 7  
Integration 2.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 0 $ 8
Freight Segment    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold  
Freight Segment | Integration 3.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 1  
Transit Segment | Integration 3.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 6  
Cost of goods sold | Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold  
Cost of goods sold | Transit Segment | Integration 3.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 2  
Selling, general and administrative expenses | Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense  
Selling, general and administrative expenses | Transit Segment | Integration 3.0    
Restructuring Cost and Reserve [Line Items]    
Total Integration restructuring charges $ 4