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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2019
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, 2019
December 31, 2018
(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

(76
)
14

90

(71
)
19

Developed technology
5 years
5

(4
)
1

5

(3
)
2

Total
 
$
95

$
(80
)
$
15

$
95

$
(74
)
$
21


Amortization of intangible assets during the years ended December 31, 2019, 2018 and 2017 was $5 million for each period. 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, 2019 is expected to be as follows:
Year ending December 31:
Amount
(in millions)
2020
$
5

2021
4

2022
4

2023
2

Total
$
15