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GOODWILL AND INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
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/adjustments7 — 7 
Foreign currency impact8 17 25 
Balance at March 31, 2023$7,100 $1,440 $8,540 
As of March 31, 2023 and December 31, 2022, the Company’s trade names had a net carrying amount of $603 million and $602 million, respectively. The Company believes these intangibles have indefinite lives, with the exception of the right to use the GE Transportation trade name, to which the Company has assigned a useful life of 5 years.
Intangible assets of the Company, other than goodwill and trade names, consist of the following:
 March 31, 2023December 31, 2022
In millionsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Backlog$1,427 $(443)$984 $1,425 $(415)$1,010 
Customer relationships1,277 (382)895 1,274 (362)912 
Acquired technology1,272 (421)851 1,273 (395)878 
Total$3,976 $(1,246)$2,730 $3,972 $(1,172)$2,800 
At March 31, 2023 the weighted average remaining useful lives of backlog, customer relationships and acquired technology were 9 years, 16 years and 8 years, respectively. The backlog intangible asset primarily consists of in-place long-term service agreements acquired by the Company in conjunction with the acquisition of GE Transportation. Amortization expense for intangible assets was $75 million and $73 million for the three months ended March 31, 2023 and 2022, respectively.
Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2023$219 
2024$283 
2025$266 
2026$262 
2027$257