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RESTRUCTURING - Schedule of Restructuring Charges (Details) - Integration 3.0 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 4 $ 15
Corporate Activities and Elimination    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 2 2
Freight Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 1 4
Transit Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1 $ 9
Cost of goods sold | Freight Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Product and Service Sold Cost of Product and Service Sold
Restructuring charges $ 0 $ 2
Cost of goods sold | Transit Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Product and Service Sold Cost of Product and Service Sold
Restructuring charges $ 0 $ 3
Selling, general and administrative expenses | Freight Segment | Operating Segments    
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 Expense
Restructuring charges $ 1 $ 2
Selling, general and administrative expenses | Transit Segment | Operating Segments    
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 Expense
Restructuring charges $ 1 $ 6