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GOODWILL AND INTANGIBLE ASSETS
 3 Months Ended
Mar. 31, 2022
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, 2021$7,073 $1,514 $8,587 
Additions/adjustments1 (2)(1)
Foreign currency impact17 (36)(19)
Balance at March 31, 2022$7,091 $1,476 $8,567 
As of March 31, 2022 and December 31, 2021, the Company’s trade names had a net carrying amount of $621 million and $635 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:
In millionsMarch 31,
2022		December 31,
2021
Backlog, net of accumulated amortization of $342 and $309
$1,096 $1,114 
Customer relationships, net of accumulated amortization of $345 and $331
963 979 
Acquired technology, net of accumulated amortization of $360 and $334
952 977 
Total$3,011 $3,070 
The weighted average remaining useful lives of backlog, customer relationships and acquired technology were 10 years, 17 years and 9 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 in 2019. Amortization expense for intangible assets was $73 million and $70 million for the three months ended March 31, 2022 and 2021, respectively.
Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2022$218 
2023$290 
2024$280 
2025$264 
2026$260