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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges $ 49 $ 46
Freight Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 9 14
Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 40 32
Cost of goods sold | Freight Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 4 13
Cost of goods sold | Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 25 26
Selling, general and administrative expenses | Freight Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 5 1
Selling, general and administrative expenses | Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges 13 6
Amortization expense | Transit Segment    
Restructuring Cost and Reserve [Line Items]    
Total Integration 2.0 restructuring charges $ 2 $ 0