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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]      
Total Integration 2.0 restructuring charges $ 28 $ 49 $ 46
Freight Segment      
Restructuring Cost and Reserve [Line Items]      
Total Integration 2.0 restructuring charges 3 9 14
Transit Segment      
Restructuring Cost and Reserve [Line Items]      
Total Integration 2.0 restructuring charges $ 25 $ 40 $ 32
Cost of goods sold | Freight Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold Cost of Goods and Services Sold Cost of Goods and Services Sold
Total Integration 2.0 restructuring charges $ 7 $ 4 $ 13
Cost of goods sold | Transit Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold Cost of Goods and Services Sold Cost of Goods and Services Sold
Total Integration 2.0 restructuring charges $ 13 $ 25 $ 26
Selling, general and administrative expenses | Freight Segment      
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 Selling, General and Administrative Expense
Total Integration 2.0 restructuring charges $ 0 $ 5 $ 1
Selling, general and administrative expenses | Transit Segment      
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 Selling, General and Administrative Expense
Total Integration 2.0 restructuring charges $ 10 $ 13 $ 6
Other income, net | Freight Segment      
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 Selling, General and Administrative Expense
Total Integration 2.0 restructuring charges $ (4) $ 0 $ 0
Amortization expense | Transit Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Amortization expense for intangible assets Amortization expense for intangible assets Amortization expense for intangible assets
Total Integration 2.0 restructuring charges $ 2 $ 2 $ 0