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GOODWILL AND INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill by Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,710
Foreign currency impact	77
Ending balance	8,787
Freight Segment
Goodwill [Roll Forward]
Beginning balance	7,248
Foreign currency impact	16
Ending balance	7,264
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,462
Foreign currency impact	61
Ending balance	$ 1,523

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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