Goodwill and Other Identifiable Intangible Assets
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2016 was as follows:
($ in millions)
Performance
Coatings
 
Industrial
Coatings
 
Glass
 
Total
Balance, December 31, 2015
$
3,073

 
$
552

 
$
44

 
$
3,669

Acquisitions
4

 
1

 
—

 
5

Currency
52

 
16

 
1

 
69

Balance, March 31, 2016
$
3,129

 
$
569

 
$
45

 
$
3,743


The carrying amount of acquired trademarks with indefinite lives totaled $1.3 billion as of March 31, 2016 and December 31, 2015.
The Company’s identifiable intangible assets with finite lives are being amortized over their estimated useful lives and are detailed below:
 
March 31, 2016
 
December 31, 2015
($ in millions)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Acquired technology
$
576

 
$
(432
)
 
$
144

 
$
572

 
$
(421
)
 
$
151

Customer-related intangibles
1,300

 
(611
)
 
689

 
1,267

 
(574
)
 
693

Trade names
137

 
(67
)
 
70

 
132

 
(61
)
 
71

Other
40

 
(28
)
 
12

 
39

 
(26
)
 
13

Balance
$
2,053

 
$
(1,138
)
 
$
915

 
$
2,010

 
$
(1,082
)
 
$
928


Aggregate amortization expense related to these identifiable intangible assets for the three months ended March 31, 2016 and 2015 was $30 million and $33 million, respectively.
As of March 31, 2016, estimated future amortization expense of identifiable intangible assets is as follows:
($ in millions)
Future Amortization Expense
Remaining nine months of 2016
$
95

2017
125

2018
120

2019
110

2020
95

2021
95

Thereafter
275