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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
intangible assets [Table Text Block]
Intangible assets, net as of March 31, 2018 and December 31, 2017, are comprised of the following:
 
 
 
March 31, 2018
 
December 31, 2017
 
Estimated Weighted Average Useful Life (years)
 
Gross Carrying Value    
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value    
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(Dollars in Millions)
Definite-Lived:
 
 
Developed technology
8
 
$
41

 
$
29

 
$
12

 
$
40

 
$
27

 
$
13

Customer related
10
 
91

 
39

 
52

 
88

 
35

 
53

Capitalized software development
4
 
10

 
1

 
9

 
8

 
1

 
7

Other
23
 
13

 
1

 
12

 
13

 
1

 
12

Subtotal
 
 
155

 
70

 
85

 
149

 
64

 
85

Indefinite-Lived:
 
 
Goodwill
 
 
48

 
—

 
48

 
47

 
—

 
47

    Total
 
 
$
203

 
$
70

 
$
133

 
$
196

 
$
64

 
$
132
Schedule of Intangible Assets and Goodwill [Table Text Block]
A roll-forward of the carrying amounts of intangible assets is presented below:
 
Definite-lived intangibles
 
 
 
 
 
Developed Technology
 
Customer Related
 
Capitalized Software Development
 
Other
 
Goodwill
Total
 
(Dollars in Millions)
December 31, 2017
$
13

 
$
53

 
$
7

 
$
12

 
$
47

 
$
132

Additions
—

 
—

 
2

 
—

 
—

 
2

Foreign currency
—

 
2

 
—

 
—

 
1

 
3

Amortization
(1
)
 
(3
)
 
—

 
—

 
—

 
(4
)
March 31, 2018
$
12

 
$
52

 
$
9

 
$
12

 
$
48

 
$
133