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GOODWILL AND INTANGIBLE ASSETS - Change in the Carrying Amount of Goodwill by Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,780
Additions/adjustments	9
Foreign currency impact	(3)
Ending balance	8,786
Freight Segment
Goodwill [Roll Forward]
Beginning balance	7,294
Additions/adjustments	9
Foreign currency impact	(23)
Ending balance	7,280
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,486
Additions/adjustments	0
Foreign currency impact	20
Ending balance	$ 1,506

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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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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