GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Change in the Carrying Amount of Goodwill by Segment

The change in the carrying amount of goodwill by segment is as follows:

In millions	Freight Segment		Transit Segment		Total
Balance at December 31, 2023	$	7,294	$	1,486	$	8,780
Additions/adjustments	(1)		—		(1)
Foreign currency impact	(14)		(35)		(49)
Balance at March 31, 2024	$	7,279	$	1,451	$	8,730

Schedule of Intangible Assets of the Company, Other Than Goodwill and Trade Names

Intangible assets of the Company, other than goodwill and trade names, consist of the following:

	March 31, 2024						December 31, 2023
In millions	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Backlog	$	1,428	$	(552)	$	876	$	1,431	$	(526)	$	905
Customer relationships	1,322		(444)		878		1,333		(431)		902
Acquired technology	1,287		(526)		761		1,283		(497)		786
Total	$	4,037	$	(1,522)	$	2,515	$	4,047	$	(1,454)	$	2,593

Schedule of Amortization Expense

Amortization expense for the five succeeding years is estimated to be as follows:

In millions
Remainder of 2024	$	215
2025	$	272
2026	$	267
2027	$	262
2028	$	261