Goodwill and Other Identifiable Intangible Assets
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets
Goodwill and Other Identifiable Intangible Assets
The change in the carrying amount of goodwill attributable to each reportable segment for the nine months ended September 30, 2016 was as follows:
($ in millions)
Performance
Coatings
 
Industrial
Coatings
 
Glass
 
Total
Balance, December 31, 2015
$
3,073

 
$
552

 
$
44

 
$
3,669

Acquisitions
2

 
130

 
—

 
132

Reclassifications to Assets held for sale
—

 
—

 
(44
)
 
(44
)
Currency
(67
)
 
11

 
—

 
(56
)
Balance, September 30, 2016
$
3,008

 
$
693

 
$
—

 
$
3,701


The carrying amount of acquired trademarks with indefinite lives totaled $1.2 billion and $1.3 billion as of September 30, 2016 and December 31, 2015, respectively.
The Company’s identifiable intangible assets with finite lives are being amortized over their estimated useful lives and are detailed below:
 
September 30, 2016
 
December 31, 2015
($ in millions)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Acquired technology
$
577

 
$
(444
)
 
$
133

 
$
572

 
$
(421
)
 
$
151

Customer-related intangibles
1,334

 
(641
)
 
693

 
1,267

 
(574
)
 
693

Trade names
144

 
(72
)
 
72

 
132

 
(61
)
 
71

Other
41

 
(29
)
 
12

 
39

 
(26
)
 
13

Balance
$
2,096

 
$
(1,186
)
 
$
910

 
$
2,010

 
$
(1,082
)
 
$
928


Aggregate amortization expense related to these identifiable intangible assets for the three and nine months ended September 30, 2016 was $31 million and $91 million, respectively, and for the three and nine months ended September 30, 2015 was $33 million and $99 million, respectively.
As of September 30, 2016, estimated future amortization expense of identifiable intangible assets is as follows:
($ in millions)
Future Amortization Expense
Remaining three months of 2016
$
31

2017
135

2018
130

2019
120

2020
105

2021
105

Thereafter
284