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Intangible Assets and Goodwill
12 Months Ended
Jan. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
Intangible Assets and Goodwill
At the end of 2016 and 2015, the gross and net amounts of intangible assets were:
(Dollars in Millions)
 
2016
 
2015
Intangible assets with definite lives:
 
 

 
 

Patents and trademarks — gross
 
$
10,521

 
8,299

Less accumulated amortization
 
5,076

 
4,745

Patents and trademarks — net
 
$
5,445

 
3,554

Customer relationships and other intangibles — gross
 
$
17,615

 
17,583

Less accumulated amortization
 
6,515

 
5,816

Customer relationships and other intangibles — net
 
$
11,100

 
11,767

Intangible assets with indefinite lives:
 
 

 
 

Trademarks
 
$
6,888

 
7,023

Purchased in-process research and development
 
3,443

 
3,420

Total intangible assets with indefinite lives
 
$
10,331

 
10,443

Total intangible assets — net
 
$
26,876

 
25,764



Goodwill as of January 1, 2017 and January 3, 2016, as allocated by segment of business, was as follows:
(Dollars in Millions)
 
Consumer
 
Pharmaceutical
 
Med Devices
 
Total
Goodwill at December 28, 2014
 
$
7,675

 
2,626

 
11,531

 
21,832

Goodwill, related to acquisitions
 
110

 
366

 
34

 
510

Goodwill, related to divestitures
 
(119
)
 
(17
)
 
(57
)
 
(193
)
Currency translation/other
 
(426
)
 
(86
)
 
(8
)
 
(520
)
Goodwill at January 3, 2016
 
$
7,240

 
2,889

 
11,500

 
21,629

Goodwill, related to acquisitions
 
1,362

 

 
210

 
1,572

Goodwill, related to divestitures
 
(63
)
 
(12
)
 

 
(75
)
Currency translation/other
 
(276
)
 
(37
)
 
(8
)
 
(321
)
Goodwill at January 1, 2017
 
$
8,263

 
2,840

 
11,702

 
22,805



The weighted average amortization periods for patents and trademarks and customer relationships and other intangible assets are 19 years and 24 years, respectively. The amortization expense of amortizable assets included in cost of products sold was $1.2 billion, $1.2 billion and $1.4 billion before tax, for the fiscal years ended January 1, 2017, January 3, 2016 and December 28, 2014, respectively. The estimated amortization expense, including Abbott Medical Optics (AMO), for the five succeeding years approximates $1.5 billion before tax, per year. Intangible asset write-downs are included in Other (income) expense, net.

See Note 20 to the Consolidated Financial Statements for additional details related to acquisitions and divestitures.