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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, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,508
Additions/adjustments	102
Foreign currency impact	(20)
Ending balance	8,590
Freight Segment
Goodwill [Roll Forward]
Beginning balance	7,085
Additions/adjustments	102
Foreign currency impact	(1)
Ending balance	7,186
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,423
Additions/adjustments	0
Foreign currency impact	(19)
Ending balance	$ 1,404

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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-Topic 852
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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

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