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RESTRUCTURING - Schedule of Restructuring Charges (Details) - Integration 3.0 - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 3 $ 7
Corporate Activities and Elimination    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges (1) 0
Freight Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 2 1
Transit Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 2 6
Cost of goods sold | Freight Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1 $ 1
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Product and Service Sold Cost of Product and Service Sold
Cost of goods sold | Transit Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1 $ 2
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Product and Service Sold Cost of Product and Service Sold
Selling, general and administrative expenses | Freight Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1 $ 0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense
Selling, general and administrative expenses | Transit Segment | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1 $ 4
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense