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Identified Intangible Assets
 9 Months Ended
Sep. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Identified Intangible Assets Identified Intangible Assets
Identified intangible assets as of September 27, 2020 and December 31, 2019, respectively, were composed of the following:
September 27, 2020December 31, 2019
Gross carrying
amount		Accumulated
amortization		Gross carrying
amount		Accumulated
amortization
In-process R&D (IPR&D) 1)
206 — 272 — 
Marketing-related82 (79)81 (67)
Customer-related967 (379)968 (340)
Technology-based7,968 (6,385)8,063 (5,357)
Identified intangible assets9,223 (6,843)9,384 (5,764)
(1)  IPR&D is not subject to amortization until completion or abandonment of the associated research and development effort.
The estimated amortization expense for these identified intangible assets for each of the five succeeding years is:
2020 (remaining) 176 
2021662 
2022563 
2023337 
2024169 
Thereafter473 
All intangible assets, excluding IPR&D and goodwill, are subject to amortization and have no assumed residual value.

The expected weighted average remaining life of identified intangibles is 4 years as of September 27, 2020 (December 31, 2019: 3 years).