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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, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,780
Additions/adjustments	(1)
Foreign currency impact	(49)
Ending balance	8,730
Freight Segment
Goodwill [Roll Forward]
Beginning balance	7,294
Additions/adjustments	(1)
Foreign currency impact	(14)
Ending balance	7,279
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,486
Additions/adjustments	0
Foreign currency impact	(35)
Ending balance	$ 1,451

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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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