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GOODWILL AND OTHER INTANGIBLES-NET
 12 Months Ended
Dec. 31, 2020
Goodwill And Other Intangible Assets Net [Abstract]  
Goodwill and Other Intangible Assets, Net
The following table summarizes the change in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 by segment.
December 31, 2019
Acquisitions/
Divestitures
Currency
Translation
Adjustment		December 31, 2020
Aerospace$2,266 $105 $7 $2,378 
Honeywell Building Technologies3,215 62 108 3,385 
Performance Materials and Technologies5,105 — 150 5,255 
Safety and Productivity Solutions4,977 — 63 5,040 
$15,563 $167 $328 $16,058 
Other intangible assets are comprised of:
 December 31, 2020December 31, 2019
Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Determinable life intangibles:      
Patents and technology$2,159 $(1,595)$564 $2,060 $(1,481)$579 
Customer relationships3,889 (2,050)1,839 3,769 (1,766)2,003 
Trademarks327 (247)80 317 (228)89 
Other298 (267)31 297 (262)35 
 6,673 (4,159)2,514 6,443 (3,737)2,706 
Indefinite life intangibles:
Trademarks1,046 — 1,046 1,028 — 1,028 
$7,719 $(4,159)$3,560 $7,471 $(3,737)$3,734 
Intangible assets amortization expense was $358 million, $415 million and $395 million for the years ended December 31, 2020, 2019 and 2018. Estimated intangible asset amortization expense for each of the next five years approximates $335 million in 2021, $311 million in 2022, $272 million in 2023, $250 million in 2024 and $239 million in 2025.