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GOODWILL AND OTHER INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS
Intangible assets and goodwill consist of the following (in millions):
September 30, 2019Weighted
Average
Useful Life		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Amortizable intangible assets:
Customer relationships20 years$541  $(158) $383  
Technology17 years317  (148) 169  
Other13 years61  (31) 30  
Indefinite-lived intangible assets:
Trademarks1,134  1,134  
Total intangible assets$2,053  $(337) $1,716  
Goodwill$1,909  
 
December 31, 2018Weighted
Average
Useful Life		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Amortizable intangible assets:
Customer relationships20 years$554  $(138) $416  
Technology17 years321  (134) 187  
Other14 years60  (28) 32  
Indefinite-lived intangible assets:
Trademarks1,144  —  1,144  
Total intangible assets$2,079  $(300) $1,779  
Goodwill$1,949  

Goodwill
The Company tests goodwill and indefinite-lived intangible assets for impairment during the fourth quarter of each year, or more frequently should circumstances change or events occur that would more likely than not reduce the fair value of a reporting unit below its carrying amount. No testing was deemed necessary in the first nine months of 2019. The changes in the net carrying amount of goodwill by segment are as follows (in millions):
CompositesInsulationRoofingTotal
Balance at December 31, 2018$57  $1,495  $397  $1,949  
Foreign currency translation—  (37) (3) (40) 
Balance at September 30, 2019$57  $1,458  $394  $1,909  
Other Intangible Assets
The Other category below primarily includes franchise agreements and quarry and emission rights. The changes in the gross carrying amount of intangible assets by asset group are as follows (in millions):
Customer RelationshipsTechnologyTrademarksOtherTotal
Balance at December 31, 2018$554  $321  $1,144  $60  $2,079  
Other additions, net—  —  —  2  2  
Foreign currency translation(13) (4) (10) (1) (28) 
Balance at September 30, 2019$541  $317  $1,134  $61  $2,053  
The estimated amortization expense for intangible assets for the next five years is as follows (in millions):
PeriodAmortization  
2020$50  
2021$50  
2022$45  
2023$42  
2024$39