Goodwill and Other Identifiable Intangible Assets
 6 Months Ended
Jun. 30, 2017
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 six months ended June 30, 2017 was as follows:
($ in millions)
Performance
Coatings
 
Industrial
Coatings
 
Total
Balance, December 31, 2016
$
2,870

 
$
702

 
$
3,572

Acquisitions
24

 
10

 
34

Foreign currency
207

 
32

 
239

Balance, June 30, 2017
$
3,101

 
$
744

 
$
3,845


A summary of the carrying value of the Company's identifiable intangible assets is as follows:
 
June 30, 2017
 
December 31, 2016
($ in millions)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Trademarks - indefinite lives
$
1,216

 
N/A

 
$
1,216

 
$
1,107

 
N/A

 
$
1,107

 
 
 
 
 
 
 
 
 
 
 
 
Customer-related intangibles
$
1,378

 
$
(696
)
 
$
682

 
$
1,272

 
$
(618
)
 
$
654

Acquired technology
602

 
$
(470
)
 
132

 
587

 
(446
)
 
141

Trade names
156

 
(80
)
 
76

 
142

 
(71
)
 
71

Other
43

 
(31
)
 
12

 
38

 
(28
)
 
10

Balance
$
3,395

 
$
(1,277
)
 
$
2,118

 
$
3,146

 
$
(1,163
)
 
$
1,983


The Company’s identifiable intangible assets with finite lives are being amortized over their estimated useful lives. Aggregate amortization expense related to these identifiable intangible assets for the three months ended June 30, 2017 and 2016 was $32 million and $30 million, respectively, and for the six months ended June 30, 2017 and 2016 was $63 million and $60 million, respectively.
As of June 30, 2017, estimated future amortization expense of identifiable intangible assets is as follows:
($ in millions)
Future Amortization Expense
Remaining six months of 2017
$
57

2018
115

2019
100

2020
90

2021
85

2022
85

Thereafter
370