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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	$ 13	$ 30
Freight Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	3	7
Transit Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	10	23
Cost of goods sold | Freight Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	2	4
Cost of goods sold | Transit Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	11	17
Selling, general and administrative expenses | Freight Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	1	3
Selling, general and administrative expenses | Transit Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	(1)	4
Amortization expense | Transit Segment
Restructuring Cost and Reserve [Line Items]
Total Integration 2.0 restructuring charges	$ 0	$ 2

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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