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Intangible Assets and Goodwill
9 Months Ended
Oct. 01, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill INTANGIBLE ASSETS AND GOODWILL
Intangible assets that have finite useful lives are amortized over their estimated useful lives. The latest annual impairment assessment of goodwill and indefinite lived intangible assets was completed in the fiscal fourth quarter of 2022. Future impairment tests for goodwill and indefinite lived intangible assets will be performed annually in the fiscal fourth quarter, or sooner, if warranted.
(Dollars in Millions)October 1, 2023January 1, 2023
Intangible assets with definite lives:  
Patents and trademarks — gross$39,284 39,388 
Less accumulated amortization(23,052)(20,616)
Patents and trademarks — net16,232 18,772 
Customer relationships and other intangibles — gross19,844 19,764 
Less accumulated amortization(12,159)(11,363)
Customer relationships and other intangibles — net(1)
7,685 8,401 
Intangible assets with indefinite lives:  
Trademarks1,640 1,630 
Purchased in-process research and development9,464 9,686 
Total intangible assets with indefinite lives11,104 11,316 
Total intangible assets — net$35,021 38,489 
(1)The majority is comprised of customer relationships


Goodwill as of October 1, 2023 was allocated by segment of business as follows:
(Dollars in Millions)Innovative MedicineMedTechTotal
Goodwill at January 1, 2023
$10,184 25,863 36,047 
Goodwill, related to acquisitions— — — 
Goodwill, related to divestitures— — — 
Currency translation/Other(35)112 *77 
Goodwill at October 1, 2023
$10,149 25,975 36,124 
*Includes purchase price allocation adjustment for Abiomed

The weighted average amortization period for patents and trademarks is 11 years. The weighted average amortization period for customer relationships and other intangible assets is 18 years. The amortization expense of amortizable intangible assets for continuing operations included in cost of products sold was $1.1 billion and $1.0 billion for the fiscal third quarters ended October 1, 2023 and October 2, 2022, respectively. The amortization expense of amortizable intangible assets for continuing operations included in cost of products sold was $3.4 billion and $3.0 billion for the fiscal nine months ended October 1, 2023 and October 2, 2022, respectively. Intangible asset write-downs are included in Other (income) expense, net, with the exception of In-Process research and development which are included in the In-Process research and development impairments line.
The estimated amortization expense for approved products from continuing operations, before tax, for the five succeeding years is approximately:
(Dollars in Millions)
20232024202520262027
$4,5004,3003,5002,9002,300

See Note 10 to the Consolidated Financial Statements for additional details related to acquisitions and divestitures.
See Note 12 to the Consolidated Financial Statements for additional details related to discontinued operations.