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GOODWILL AND INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2024$7,248 $1,462 $8,710 
Foreign currency impact16 61 77 
Balance at March 31, 2025$7,264 $1,523 $8,787 
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, 2025December 31, 2024
In millionsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Backlog$1,309 $(546)$763 $1,415 $(629)$786 
Customer relationships1,347 (505)842 1,329 (480)849 
Acquired technology1,316 (639)677 1,318 (614)704 
Total$3,972 $(1,690)$2,282 $4,062 $(1,723)$2,339 
Schedule of Amortization Expense
Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2025$203 
2026$271 
2027$267 
2028$266 
2029$266