Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The number of businesses acquired by the entity during the period.

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ACQUISITIONS - Narrative (Details) $ in Millions		3 Months Ended	12 Months Ended
ACQUISITIONS - Narrative (Details) $ in Millions	Dec. 22, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2024 USD ($) segment	Dec. 31, 2022 USD ($) business	Dec. 21, 2023
LKZ
Business Acquisition [Line Items]
Ownership percent					50.00%
Freight Segment
Business Acquisition [Line Items]
Number of businesses acquired \| business				3
Digital Intelligence \| Freight Segment
Business Acquisition [Line Items]
Business combination, consideration transferred				$ 89
Digital Electronics Product Line \| Freight Segment
Business Acquisition [Line Items]
Number of businesses acquired \| business				2
Services Product Line \| Freight Segment
Business Acquisition [Line Items]
Number of businesses acquired \| business				1
Strategic Acquisitions
Business Acquisition [Line Items]
Number of businesses acquired \| segment			4
Business combination, consideration transferred			$ 168
Strategic Acquisitions \| Transit Segment
Business Acquisition [Line Items]
Number of businesses acquired \| segment			2
Strategic Acquisitions \| Digital Electronics Product Line \| Freight Segment
Business Acquisition [Line Items]
Number of businesses acquired \| segment			1
Strategic Acquisitions \| Components Product Line \| Freight Segment
Business Acquisition [Line Items]
Number of businesses acquired \| segment			1
LKZ
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 111
Percentage of voting interests acquired	50.00%
Remeasurement gain	$ 35
Total purchase price (as a percent)	100.00%
L&M Radiator, Inc
Business Acquisition [Line Items]
Business combination, consideration transferred		$ 245