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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, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,710
Additions/adjustments	949
Foreign currency impact	194
Ending balance	9,853
Freight Segment
Goodwill [Roll Forward]
Beginning balance	7,248
Additions/adjustments	949
Foreign currency impact	14
Ending balance	8,211
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,462
Additions/adjustments	0
Foreign currency impact	180
Ending balance	$ 1,642

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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Amount of increase (decrease) from measurement period adjustment 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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