GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary 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, 2021	$	7,073	$	1,514	$	8,587
Additions	35		—		35
Foreign currency impact	(23)		(91)		(114)
Balance at December 31, 2022	$	7,085	$	1,423	$	8,508
Additions	215		—		215
Disposals	(4)		—		(4)
Foreign currency impact	16		45		61
Balance at December 31, 2023	$	7,312	$	1,468	$	8,780

Summary of Intangible Assets of the Company, Other Than Goodwill and Trademarks

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

	December 31, 2023						December 31, 2022
In millions	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Backlog	$	1,431	$	(526)	$	905	$	1,425	$	(415)	$	1,010
Customer relationships	1,333		(431)		902		1,274		(362)		912
Acquired technology	1,283		(497)		786		1,273		(395)		878
Total	$	4,047	$	(1,454)	$	2,593	$	3,972	$	(1,172)	$	2,800

Summary of Estimated Amortization Expense Five Succeeding Years

Estimated amortization expense for the five succeeding years is as follows (in millions):

2024	$	289
2025	$	272
2026	$	267
2027	$	262
2028	$	261