INTANGIBLES (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

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, 2019	$	6,877	$	1,484	$	8,361
Additions	2		—		2
Disposals	(6)		—		(6)
Foreign currency impact	(1)		129		128
Balance at December 31, 2020	$	6,872	$	1,613	$	8,485
Additions	214		15		229
Foreign currency impact	(13)		(114)		(127)
Balance at December 31, 2021	$	7,073	$	1,514	$	8,587

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,
In millions	2021		2020
Intellectual property, patents, and other intangibles, net of accumulated amortization of $334 and $223	$	977	$	1,008
Backlog, net of accumulated amortization of $309 and $206	1,114		1,224
Customer relationships, net of accumulated amortization of $331 and $276	979		986
Total	$	3,070	$	3,218

Estimated Amortization Expense Five Succeeding Years

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

2022	$	291
2023	$	290
2024	$	281
2025	$	278
2026	$	274