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RESTRUCTURING (Details) - Integration 2.0 - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 46 $ 69
Restructuring period 3 years    
Transit Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   32  
Freight Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   14  
Cost of Goods Sold      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   39  
Selling, General and Administrative Expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 7  
Minimum      
Restructuring Cost and Reserve [Line Items]      
Total expected costs $ 135    
Maximum      
Restructuring Cost and Reserve [Line Items]      
Total expected costs $ 165