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GOODWILL AND INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2023
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 millionsFreight SegmentTransit SegmentTotal
Balance at December 31, 2022$7,085 $1,423 $8,508 
Additions/adjustments102 — 102 
Foreign currency impact(1)(19)(20)
Balance at September 30, 2023$7,186 $1,404 $8,590 
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:
 September 30, 2023December 31, 2022
In millionsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Backlog$1,428 $(498)$930 $1,425 $(415)$1,010 
Customer relationships1,322 (407)915 1,274 (362)912 
Acquired technology1,283 (473)810 1,273 (395)878 
Total$4,033 $(1,378)$2,655 $3,972 $(1,172)$2,800 
Schedule of Amortization Expense Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2023$75 
2024$287 
2025$270 
2026$266 
2027$262