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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges $ 4 $ 8 $ 12 $ 17
Freight Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges (1) 2 0 4
Transit Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges 5 6 12 13
Cost of goods sold | Freight Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges 3 1 4 2
Cost of goods sold | Transit Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges 1 3 4 6
Selling, general and administrative expenses | Freight Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges 0 1 0 2
Selling, general and administrative expenses | Transit Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges 3 3 6 5
Other income, net | Freight Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges (4) 0 (4) 0
Amortization expense | Transit Segment        
Restructuring Cost and Reserve [Line Items]        
Total Integration 2.0 restructuring charges $ 1 $ 0 $ 2 $ 2