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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS
The following summarizes goodwill and other intangible assets:
 
 
December 31, 2018
December 31, 2017
(in millions)
Weighted Average Amortization Period
Gross Carrying Amount
Accumulated Amortization
Net
Carrying Amount
Gross Carrying Amount
Accumulated Amortization
Net Carrying Amount
Goodwill
 
$
289

$
—

$
289

$
289

$
—

$
289

Amortizable intangibles:
 
 
 
 
 
 
 
Customer contracts
10 years
90

(71
)
19

210

(187
)
23

Developed technology
5 years
5

(3
)
2

6

(3
)
3

Total
 
$
95

$
(74
)
$
21

$
216

$
(190
)
$
26


Amortization of intangible assets during the years ended December 31, 2018, 2017 and 2016 was $5 million, $5 million and $16 million, respectively. As of December 31, 2018, we had $120 million of fully amortized customer contracts and $1 million of fully amortized developed technology. We evaluate the remaining useful life of intangible assets annually to determine whether events and circumstances warrant a revision to the estimated remaining useful life. 
Expense related to intangibles amortization in future periods as of December 31, 2018 is expected to be as follows:
Year ending December 31:
Amount
(in millions)
2019
$
5

2020
5

2021
4

2022
4

2023
3

Total
$
21