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Intangible Assets and Goodwill
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill Intangible assets and goodwill
 
A.  Intangible assets
 
Intangible assets were comprised of the following:
 
  March 31, 2021
(Millions of dollars)Weighted
Amortizable
Life (Years)		Gross
Carrying
Amount		Accumulated
Amortization		Net
Customer relationships15$2,451 $(1,614)$837 
Intellectual property121,444 (1,097)347 
Other14179 (117)62 
Total finite-lived intangible assets14$4,074 $(2,828)$1,246 
  December 31, 2020
Weighted
Amortizable
Life (Years)		Gross
Carrying
Amount		Accumulated
Amortization		Net
Customer relationships15$2,493 $(1,600)$893 
Intellectual property121,439 (1,073)366 
Other14164 (115)49 
Total finite-lived intangible assets14$4,096 $(2,788)$1,308 

Amortization expense for the three months ended March 31, 2021 and 2020 was $77 million and $80 million, respectively. Amortization expense related to intangible assets is expected to be:

(Millions of dollars)
Remaining Nine Months of 20212022202320242025Thereafter
$225$284$225$167$157$188
 
B.  Goodwill
 
No goodwill was impaired during the three months ended March 31, 2021 or 2020.
The changes in carrying amount of goodwill by reportable segment for the three months ended March 31, 2021 were as follows: 
(Millions of dollars)December 31,
2020
Acquisitions 1
Other Adjustments 2
March 31,
2021
Construction Industries
Goodwill$320 $— $(14)$306 
Impairments(22)— — (22)
Net goodwill298 — (14)284 
Resource Industries
Goodwill4,253 — (43)4,210 
Impairments(1,175)— — (1,175)
Net goodwill3,078 — (43)3,035 
Energy & Transportation
Goodwill2,959 32 (22)2,969 
All Other 3
Goodwill59 — (4)55 
Consolidated total
Goodwill7,591 32 (83)7,540 
Impairments(1,197)— — (1,197)
Net goodwill$6,394 $32 $(83)$6,343 


1 See Note 21 for additional details.
2 Other adjustments are comprised primarily of foreign currency translation.
3 Includes All Other operating segment (See Note 16).